PS3, Wii and 3DS are operational right now. N64 and GameCube are in front of the TV just looking nice and there's a PS2, DS and more than a couple GameBoys somewhere around the house.
Not counting the PC of course, but it's really not a gaming rig. The best it's been doing lately is some Warcraft 3.
I got quite the array of gaming systems, which most are from Nintendo. Original Gameboy, Gameboy color, Gameboy Advance, Gamneboy Advance SP, DS Lite, 3DS, Gamecube, Playstation 2, and Xbox.