PC: World of Warcraft. (Have to pull out the NWN, tho)
Powerbook: World of Warcraft.
Nintendo DS: Zoo Keeper, Urban Asphault, Worms World Party (GBA)
Game Cube: Animal Crossing. Need to finish Zelda Wind Waker
XBOX: Halo2 against my 12yo daughter (yes, I use a handicap
)
PS2: occasionally pull out the pistol games
N64: Pokemon Colloseum
Mame Arcade Cabinet: Wheee! I built myself a mini arcade cabinet based on the old PacMan stand up. Its got 2000+ arcade roms!
Motorola V600: Solytare
Palm Zire 71: Aldon's Crossing
iPod: Solitaire
GB Pocket and Original: Tetris!!!
Tandy TRS-80 CoCo-III: Dungeons of Daggorath w00t!!!