I have to admit, when I write one to get PV's and backlinks to whichever site or site(s) of interest, I publish through Associated Content, display only so I have rights to republish then shoot it to Digg, yahoo buzz, stumbled upon...sometimes more if I have time. I have a good PR on my AC pubisher page, JavanX3d's Source Page - Associated Contentif you're extremely bored, so I find that targeted material gets indexed and picked up quick.
Anyway, at what point in the life of a site do you find it worthwhile to use a distro service? How much do you retool the material if at all? Primarily curious so I can get the blog indexed further and extend to some of the other sites I'm mucking with.