Jamie, next time you have to get around the firewall try
http://www.stupidcensorship.com.
If that site is blocked, search for Stupid Censorship.com on Google - then when you find it, click the word 'cached' next to the search result - this brings up a google cached version of it that most likely won't be blocked by your firewall.
But you're the expert - so if this is nothing new or you've already tried it and it doesn't work, forget I said anything.
In any event, that's the site I use to get to Yahoo by proxy if I need to make a roster move since it's blocked at work.