Good news (i posted it above too but here it gose anyway) Doom 3 will have Linux client. Wich means Other games using Doom 3 engien will most likely suport it too also a AAA title like that will get alot of atention from of game makers.
When I asked about WineX suport for games, I meant do you have to check with the website first to make sure each particular title is suported or dose it suport any game automaticly.
I have heared of Far Cry running every thing close to max and good frame rate in Linux enviorment with non top of the line hardware. Something imposible in Windows as I have 9800pro in medium settings and still lag.