Whenever I try to load up any of the World of Minecraft servers, the loading bar gets to 1/6 - 1/5 of the way done, then stops, and whether I am playing through a browser or the client, it freezes up. (if playing on the browser, is actually locks up the browser)

After asking for some help on IRC, it was determained that is shouldn't be a problem with the client, considering how I can play other servers with it just fine (I used Windows 7, x64), and even though the loading freezes, I still appear in the game.

Any help on this? :p