I have the one from Early 2008 (so it's pretty old), but it's still a pretty capable machine for running games. It's pretty much my only computer that I do everything on

. I basically gave my Bootcamp partition half of my 250GB total space because I have so many games
Unreal Tournament 3: runs very smooth with everything at max on 1680x1050
Bioshock: beautiful at 1680x1050 with all settings on max.
Red Alert 3: 1680x1050, keep water detail on medium, textures on high.
Can also go 1920x1200 with everything on medium
Oblivion: 1920x1200 with pretty much everything on max. Only lags up when out in the wilderness near grassy areas. I only run this vanilla though, probably can't handle any of those intense mods you see on Youtube.
Half Life 2 &
Ep 1 &
Ep 2 &
Team Fortress 2: Everything completed maxed out at 1920x1200. (HDR!

) The game is beautiful; it's amazing how efficient the Source engine is, especially since it's pretty old.
Neverwinter Nights 2: Everything essentially maxed. The game is pretty inefficient when it comes to graphics though.
Hope this helps.