Steam!

So, I'm starting to use Steam more now. If you want to add me on Steam, here's my Steam ID Page.

Games I'm Actually Playing (that you can play with me!)
Team Fortress 2
Left 4 Dead
Empire: Total War

Games I'm Gonna Play for the Achivements (either single player or games you don't want to play with me)
Portal
Half-Life 2: Episode One
Half-Life 2: Episode Two
Day of Defeat: Source
Counter-Strike: Source (when they supposedly get released)

Miscellaneous Category (everything else)
Half-Life 2 -- Why aren't there achievements for this? They certainly exist for the Xbox 360.
Dawn of War II -- I think these are integrated into Steam
Sins of a Solar Empire -- I think there are achievements in this game and if so, they should be integrated into Steam

Steam also has a neat feature where you can use it to launch non-Steam games. The actual level of integration of these games is quite minor; basically, it shows up in your launcher list (basically organizing your games) and if you play the game, it lets all your Steam friends know that you're playing. Steam also tracks how many hours you've played that game, so if you like collecting data on your life, this is an enabler.