360 owners should be following
Major Nelson on twitter (if you aren't already) he'll be updating with the 360 holiday deals. They've been a bit pants so far, though.
Galactic Civilizations II is on sale for $1.99 on Impulse. It's like the Civilization games only bigger and IN SPAAAAAAAAAAAAAAACE, you also get to design your own ships, this game is awesome.
All of PopCap's downloadable games are
50% off until the 24th - If you haven't played Peggle, Plants vs Zombies or Bejeweled, you can for cheap!
Torchlight is half price on Steam, might grab this and hope it's not cheaper at Christmas.
And, of course
Team Fortress 2 is half price until Monday. Easily my favourite online team game.