You can unblock websites (like myspace,facebook or bebo) with a proxy, here are a few :
http://idislike.info
http://lasersmokingstop.info
http://mesquitsmoking.info
http://nicotinequitsmoking.info
http://nycsmokingban.info
http://quitpuffingsite.info
http://facebooking.info
Be sure to tell your friends or post them to your my space page or blog so others can enjoy.
If you want to receive daily new proxies you can join this Yahoo Group:
http://tech.groups.yahoo.com/subscribe/unblockmyspace
You Can find brand new proxies at the blog
http://notime4school.com/