MMOs:

WoW is the only one I've played for several years, but I've also played varying amounts of Anarchy Online, DAoC, FFXI, and LotRO.

Other games:

Bemani (Beatmania IIDX/pop'n music/Guitar Freaks/Drummania)
Fighting games (SSF4, ST, 3S, GG, BB, Marvel)
Cave shooters
Various console games (lately: Deus Ex:HR, Shadow of the Colossus HD, Just Cause 2, The Elder Scrolls)