I was listening to D.C. 101 this morning and heard about this website
http://www.cooltunnel.com. It allows you to get on websites that are normally blocked at work like MySpace, LJ, Facebook, ect. It seems to work. I was able to get on MySpace thought it gave me a small gliche when trying to log in but it all worked out. I think there are other websites like this one that use proxy servers to get around the firewalls. But this is the one that I know of.
Stick it to the man!
Enjoy!