I won't hold my breath... but thank you for thinking of me.
The orange box, if you haven't played it on PC already. TF2 on live is pretty sweet. That alone is worth the $30, never mind that you get portal and Half Life 2.
Rainbow six vegas is pretty good. The versus mode is garbage though. Co-op and terrorist hunts are what make the game worth buying. And the second game is quite a step up from the first.
I'm more into arcade games than retail. So from there I can recommend:
Worms; even with it being watered down, it's great. And for 5 bucks, you really can't complain.
Marble blast ultra is a great introduction to leaderboards, and the game is very fun to play. The versus mode is a little strange, but it gets intense as you get better.
Aegis wing; I always recomend this. Partially because it's a very solid shmup, with 4 player co-op. And also because it's freeeeeeeeeeeeeeeee.