Yet another cool thing from Microsoft: MSN Web Messenger. For all those who can't install software on the computer they are using, or if everything except IE is firewalled out, just navigate to http://webmessenger.msn.com/ and away you go.

MSN Web Messenger uses IE (ok, maybe it works with another browser?) and HTTP to pull off a very convincing Messenger UI. It even does the little pop-up message windows! It's not nearly as nice as the real client, but it's definately usable. Wow, I'm impressed.