Every proxy list has a submission page for webmasters. I'm looking to get a link to my proxy hosting service on those pages! If you have a proxy list and will link to me from your submission page, I'll link to your homepage from both vectroproxy.com and xproxylist.com
vectroproxy.com receives over 40,000 unique visitors per month and has solid Google traffic.
Just let me know your list's address and what anchor text you want.