Not counting funtrivia...

1. Hexic http://zone.msn.com/en/hexic/default2.htm
2. SissyFight http://www.sissyfight.com/
3. Psychobabble http://www.popcap.com/multiplayer.php?theGame=psychobabble
4. iSketch http://www.isketch.net
5. Text Twist http://zone.msn.com/en/texttwist/default

I'm actually played out on a lot of these. Another one I used to play a lot was Trivia Madness on Yahoo chat but... eh. Kind of hard to link it and it doesn't really have many players these days. It was more fun when it wasn't the same people every single day. There's a strip poker game I like but it's not appropriate.