Google Talk. Google's answer to MSN Messenger. It also has IP telephony capability. Requires a gmail account; let me know if you want one, I have 49 invites left.
This Spartan Life. An online talk-show with a difference. The difference being it is filmed entirely within a Halo2 multiplayer game. Interviews, dancing, current issue debates, you name it.
WebOS. Jason Kottke takes a good look at the web as an application platform. A good read if you're a bit of a geek.
