I merged, deduplicated, added PR, and sorted a dozen lists of press release sites.

These really fall into a number of different categories, such as news outlets vs distribution companies and places to get buzz vs places to get links.

But for now... this is just one large list:

  1. PageRank: 9 http://www.npr.org
  2. PageRank: 9 http://www.highwire.stanford.edu
  3. PageRank: 8 http://www.aip.org
  4. PageRank: 7 http://www.prweb.com
  5. PageRank: 7 http://www.programmersheaven.com
  6. PageRank: 7 http://www.prnewswire.co.uk
  7. PageRank: 7 http://www.prnewswire.com
  8. PageRank: 7 http://www.parking.org
  9. PageRank: 7 http://www.newswire.ca
  10. PageRank: 7 http://www.newslink.org
  11. PageRank: 7 http://www.marketwire.com
  12. PageRank: 7 http://www.linux.com
  13. PageRank: 7 http://www.internetworldstats.com
  14. PageRank: 7 http://www.freepress.net
  15. PageRank: 7 http://www.emediawire.com
  16. PageRank: 7 http://www.editorandpublisher.com
  17. PageRank: 7 http://www.dailyrecord.com
  18. PageRank: 7 http://www.cleoconference.org
  19. PageRank: 7 http://www.cdn-news.com
  20. PageRank: 7 http://www.businesswire.com
  21. PageRank: 7 http://www.news10now.com
  22. PageRank: 6 http://www.webpronews.com
  23. PageRank: 6 http://www.us.cision.com
  24. PageRank: 6 http://www.tmcnet.com
  25. PageRank: 6 http://www.threadwatch.org
  26. PageRank: 6 http://www.thewhir.com
  27. PageRank: 6 http://www.store.1choice4ystore.com
  28. PageRank: 6 http://www.siouxcityjournal.com
  29. PageRank: 6 http://www.promotionworld.com
  30. PageRank: 6 http://www.prlog.org
  31. PageRank: 6 http://www.pr-inside.com
  32. PageRank: 6 http://www.press-release-writing.com
  33. PageRank: 6 http://www.pressreleasenetwork.com
  34. PageRank: 6 http://www.pr.com
  35. PageRank: 6 http://www.our-hometown.com
  36. PageRank: 6 http://www.newswiretoday.com
  37. PageRank: 6 http://www.nanotech-now.com
  38. PageRank: 6 http://www.mediapost.com
  39. PageRank: 6 http://www.media-newswire.com
  40. PageRank: 6 http://www.majon.com
  41. PageRank: 6 http://www.lansingstatejournal.com
  42. PageRank: 6 http://www.joplinglobe.com
  43. PageRank: 6 http://www.indiaprwire.com
  44. PageRank: 6 http://www.guampdn.com
  45. PageRank: 6 http://www.gnet.org
  46. PageRank: 6 http://www.fibre2fashion.com
  47. PageRank: 6 http://www.ezinearticles.com
  48. PageRank: 6 http://www.earthvision.net
  49. PageRank: 6 http://www.ducttapemarketing.com
  50. PageRank: 6 http://www.downloadjunction.com
  51. PageRank: 6 http://www.directionsmag.com
  52. PageRank: 6 http://www.delawareonline.com
  53. PageRank: 6 http://www.csrwire.com
  54. PageRank: 6 http://www.cincinnati.com
  55. PageRank: 6 http://www.betanews.com
  56. PageRank: 6 http://www.24-7pressrelease.com
  57. PageRank: 6 http://news.thomasnet.com
  58. PageRank: 6 http://news.cincinnati.com
  59. PageRank: 5 http://www.your-story.org
  60. PageRank: 5 http://www.xpresspress.com
  61. PageRank: 5 http://www.webnewswire.com
  62. PageRank: 5 http://www.urlwire.com
  63. PageRank: 5 http://www.transworldnews.com
  64. PageRank: 5 http://www.topseos.com
  65. PageRank: 5 http://www.thepublish.com
  66. PageRank: 5 http://www.softwaremarketingresource.com
  67. PageRank: 5 http://www.softarea51.com
  68. PageRank: 5 http://www.seo-pr.com
  69. PageRank: 5 http://www.send2press.com
  70. PageRank: 5 http://www.searchwarp.com
  71. PageRank: 5 http://www.responsesource.com
  72. PageRank: 5 http://www.readmedia.com
  73. PageRank: 5 http://www.rapidio.org
  74. PageRank: 5 http://www.przoom.com
  75. PageRank: 5 http://www.prwebdirect.com
  76. PageRank: 5 http://www.pr-usa.net
  77. PageRank: 5 http://www.productnews.com
  78. PageRank: 5 http://www.prleap.com
  79. PageRank: 5 http://www.preweb.com
  80. PageRank: 5 http://www.presszoom.com
  81. PageRank: 5 http://www.pressreleasepoint.com
  82. PageRank: 5 http://www.pressexposure.com
  83. PageRank: 5 http://www.pressbox.co.uk
  84. PageRank: 5 http://www.powerhomebiz.com
  85. PageRank: 5 http://www.pacificfreepress.com
  86. PageRank: 5 http://www.onlineprnews.com
  87. PageRank: 5 http://www.newspad.com
  88. PageRank: 5 http://www.newsforce.com
  89. PageRank: 5 http://www.ncoic.org
  90. PageRank: 5 http://www.myjournalcourier.com
  91. PageRank: 5 http://www.michiganpr.net
  92. PageRank: 5 http://www.michiganbusiness.us
  93. PageRank: 5 http://www.mibiz.com
  94. PageRank: 5 http://www.live-pr.com
  95. PageRank: 5 http://www.lhonline.com
  96. PageRank: 5 http://www.itilcommunity.com
  97. PageRank: 5 http://www.imediafax.com
  98. PageRank: 5 http://www.hrotoday.com
  99. PageRank: 5 http://www.groupweb.com
  100. PageRank: 5 http://www.grandhaventribune.com
  101. PageRank: 5 http://www.gebbieinc.com
  102. PageRank: 5 http://www.freshnews.com
  103. PageRank: 5 http://www.free-press-release.com
  104. PageRank: 5 http://www.filecluster.com
  105. PageRank: 5 http://www.fastpitchnetworking.com
  106. PageRank: 5 http://www.express-press-release.net
  107. PageRank: 5 http://www.express-press-release.com
  108. PageRank: 5 http://www.expertclick.com
  109. PageRank: 5 http://www.eworldwire.com
  110. PageRank: 5 http://www.ereleases.com
  111. PageRank: 5 http://www.epscene.com
  112. PageRank: 5 http://www.efytimes.com
  113. PageRank: 5 http://www.eceurope.com
  114. PageRank: 5 http://www.earthtoys.com
  115. PageRank: 5 http://www.devarchive.com
  116. PageRank: 5 http://www.dbusiness.com
  117. PageRank: 5 http://www.coloradoenergy.org
  118. PageRank: 5 http://www.clickpress.com
  119. PageRank: 5 http://www.cgidir.com
  120. PageRank: 5 http://www.businessportal24.com
  121. PageRank: 5 http://www.bizwiz.com
  122. PageRank: 5 http://www.bignews.biz
  123. PageRank: 5 http://www.articledashboard.com
  124. PageRank: 5 http://www.articleblast.com
  125. PageRank: 5 http://www.articlealley.com
  126. PageRank: 5 http://www.allcapecod.com
  127. PageRank: 5 http://www.1888pressrelease.com
  128. PageRank: 4 http://www.worldacd.com
  129. PageRank: 4 http://www.usprwire.com
  130. PageRank: 4 http://www.usanews.net
  131. PageRank: 4 http://www.upload.it
  132. PageRank: 4 http://www.ukprwire.com
  133. PageRank: 4 http://www.theopenpress.com
  134. PageRank: 4 http://www.targetwire.com
  135. PageRank: 4 http://www.storebuilder.co.uk
  136. PageRank: 4 http://www.softpressrelease.com
  137. PageRank: 4 http://www.sixsigmazone.com
  138. PageRank: 4 http://www.sbwire.com
  139. PageRank: 4 http://www.prwindow.com
  140. PageRank: 4 http://www.prurgent.com
  141. PageRank: 4 http://www.prudentpressagency.com
  142. PageRank: 4 http://www.promaxum.com
  143. PageRank: 4 http://www.profnet.org
  144. PageRank: 4 http://www.printsolutionsmag.com
  145. PageRank: 4 http://www.prfree.com
  146. PageRank: 4 http://www.press.xtvworld.com
  147. PageRank: 4 http://www.pressreleasespider.com
  148. PageRank: 4 http://www.pressreleases.kcstar.com
  149. PageRank: 4 http://www.pressrelease365.com
  150. PageRank: 4 http://www.pressportal.co.za
  151. PageRank: 4 http://www.pressflash.com
  152. PageRank: 4 http://www.pr9.net
  153. PageRank: 4 http://www.openpr.com
  154. PageRank: 4 http://www.news-antique.com
  155. PageRank: 4 http://www.malebits.com
  156. PageRank: 4 http://www.made-from-india.com
  157. PageRank: 4 http://www.lunareclipse.net
  158. PageRank: 4 http://www.loraincounty.com
  159. PageRank: 4 http://www.internetwriters.com
  160. PageRank: 4 http://www.internetnewsbureau.com
  161. PageRank: 4 http://www.information-online.com
  162. PageRank: 4 http://www.ideasiteforbusiness.com
  163. PageRank: 4 http://www.golfbusinesswire.com
  164. PageRank: 4 http://www.goarticles.com
  165. PageRank: 4 http://www.freepressreleases.co.uk
  166. PageRank: 4 http://www.freepressrelease.com.au
  167. PageRank: 4 http://www.free-press-release-center.info
  168. PageRank: 4 http://www.freepressindex.com
  169. PageRank: 4 http://www.free-news-release.com
  170. PageRank: 4 http://www.enewswire.co.uk
  171. PageRank: 4 http://www.ecommwire.com
  172. PageRank: 4 http://www.dime-co.com
  173. PageRank: 4 http://www.caymanmama.com
  174. PageRank: 4 http://www.bookcatcher.com
  175. PageRank: 4 http://www.articlesmagazine.com
  176. PageRank: 4 http://www.africanewswire.net
  177. PageRank: 3 http://www.webwire.com
  178. PageRank: 3 http://www.topwirenews.com
  179. PageRank: 3 http://www.thehostingnews.com
  180. PageRank: 3 http://www.sumolabs.com
  181. PageRank: 3 http://www.selfseo.com
  182. PageRank: 3 http://www.prnuke.com
  183. PageRank: 3 http://www.prfriend.com
  184. PageRank: 3 http://www.prfocus.com
  185. PageRank: 3 http://www.pressreleasecirculation.com
  186. PageRank: 3 http://www.pressrelease001.com
  187. PageRank: 3 http://www.pressmethod.com
  188. PageRank: 3 http://www.pressmediawire.com
  189. PageRank: 3 http://www.pressflow.co.uk
  190. PageRank: 3 http://www.pressdr.com
  191. PageRank: 3 http://www.pressbox.com
  192. PageRank: 3 http://www.press-base.com
  193. PageRank: 3 http://www.pressabout.com
  194. PageRank: 3 http://www.prcompass.com
  195. PageRank: 3 http://www.prbuzz.com
  196. PageRank: 3 http://www.opportunityupdate.com
  197. PageRank: 3 http://www.onlinepressreleases.com
  198. PageRank: 3 http://www.newzalert.com
  199. PageRank: 3 http://www.newsblaster.com
  200. PageRank: 3 http://www.news.baou.com
  201. PageRank: 3 http://www.newsalbum.com
  202. PageRank: 3 http://www.nationalhomelandsecurityknowledgebase.com
  203. PageRank: 3 http://www.myfreepr.com
  204. PageRank: 3 http://www.morganarticlearchive.com
  205. PageRank: 3 http://www.mediasyndicate.com
  206. PageRank: 3 http://www.mediapeak.com
  207. PageRank: 3 http://www.media13.com
  208. PageRank: 3 http://www.i-newswire.com
  209. PageRank: 3 http://www.ideamarketers.com
  210. PageRank: 3 http://www.hungarynewswire.com
  211. PageRank: 3 http://www.freepressrelease.co.cc
  212. PageRank: 3 http://www.franchisenewscenter.com
  213. PageRank: 3 http://www.exchangenet.com
  214. PageRank: 3 http://www.epressreleases.org
  215. PageRank: 3 http://www.epicinnovations.com
  216. PageRank: 3 http://www.emailwire.com
  217. PageRank: 3 http://www.eboomwebsolutions.com
  218. PageRank: 3 http://www.clickshappen.com
  219. PageRank: 3 http://www.businessservicesuk.com
  220. PageRank: 3 http://www.bestsyndication.com
  221. PageRank: 3 http://www.articopia.com
  222. PageRank: 3 http://www.articlecity.prwebdirect.com
  223. PageRank: 3 http://www.afreego.com
  224. PageRank: 3 http://www.afly.com
  225. PageRank: 3 http://www.addpr.com
  226. PageRank: 3 http://www.12pressrelease.com
  227. PageRank: 2 http://www.washington-press-release.com
  228. PageRank: 2 http://www.tennessee-press-release.com
  229. PageRank: 2 http://www.speedypr.com
  230. PageRank: 2 http://www.seenation.com
  231. PageRank: 2 http://www.publicrelations.uk.com
  232. PageRank: 2 http://www.propressrelease.com
  233. PageRank: 2 http://www.pressrelease.com.np
  234. PageRank: 2 http://www.press-network.com
  235. PageRank: 2 http://www.pressbooth.org
  236. PageRank: 2 http://www.prbot.com
  237. PageRank: 2 http://www.prarticle.com
  238. PageRank: 2 http://www.postafreepressrelease.com
  239. PageRank: 2 http://www.ohio-press-release.com
  240. PageRank: 2 http://www.newsreleaser.com
  241. PageRank: 2 http://www.newsreelnetwork.com
  242. PageRank: 2 http://www.massachusetts-press-release.com
  243. PageRank: 2 http://www.inthepress.ru
  244. PageRank: 2 http://www.indiasoftware.com
  245. PageRank: 2 http://www.illinois-press-release.com
  246. PageRank: 2 http://www.free-press-release.info
  247. PageRank: 2 http://www.freepressreleasecenter.com
  248. PageRank: 2 http://www.epicpr.com
  249. PageRank: 2 http://www.baygo.com
  250. PageRank: 2 http://www.articleusa.com
  251. PageRank: 2 http://www.articlesphere.com
  252. PageRank: 2 http://www.articledepot.co.uk
  253. PageRank: 1 http://www.pressreleasecentre.com
  254. PageRank: 1 http://www.myactu.com
  255. PageRank: 1 http://www.learn-more.org
  256. PageRank: 1 http://www.hotmicrocap.com
  257. PageRank: 1 http://www.feelgr8.co.uk
  258. PageRank: 1 http://www.e-syndicate.net
  259. PageRank: 0 http://www.www.25pressreleases.com
  260. PageRank: 0 http://www.viloria.info
  261. PageRank: 0 http://www.software-review-center.org
  262. PageRank: 0 http://www.sanepr.com
  263. PageRank: 0 http://www.pr-gb.com
  264. PageRank: 0 http://www.pr2work.com
  265. PageRank: 0 http://www.newyork-press-release.com
  266. PageRank: 0 http://www.newdesignworld.com
  267. PageRank: 0 http://www.exactrelease.com
  268. PageRank: 0 http://www.dir.free-press-release.com
  269. PageRank: 0 http://www.devpress.com
  270. PageRank: 0 http://www.businessopportunity.biz
  271. PageRank: 0 http://www.blog-ride.co.uk
  272. PageRank: 0 http://www.bizeurope.com
  273. PageRank: 0 http://www.articlecube.com
  274. PageRank: 0 http://www.amirazemati.com