Team Fortress 2 (PC) - Getting ready for a possible TPG 6v6/CAL-O run this summer
Rainbow Six Vegas 2 (PC) - The A.C.E.S. system is awesome, except they locked my AK47 and getting Assault points is hard as hell.
S.T.A.L.K.E.R.: Shadow of Chernobyl (PC) - Best atmosphere this side of BioShock
Rising Eagle (PC) - Just found it, and it's free, so it's fun for me.
Day of Defeat 1.3/Source (PC) - Best Multiplayer game I've played yet.
The list has a distinct lack of console games because there's nothing good out for the Wii (except Brawl, which I'm somewhat sick of) and my 360 just went back in for "repairs" (read: the repair center messed up and sent me a 360 that's not from this region, and thus won't let me play my region locked games). As soon as my new 360 gets here, It'll be GTA IV and CoD 4 all day baby!