Here are some other great sites.  Each site listed here is highly recommended for it's quality content.  If you have a high quality site and would like your link included here, please use the forum and contact the user proxies.

The Free Site - Tons of freebies, freeware, samples, downloads, email, games, free software, etc...

Free Proxies - This site has tons of free proxies for you to use.  Updated often.

XRoxy - This site offers frequently updated proxy lists available for free download and subscription.