Okay... deep breath... here we go...
(In no specific order...)
...Three NES's, two GBA's (one original batch Japanese machine replete with infamous scratch), two GB's, one GBC, a PS, two SNES's, one working PAL N64, one sort-of-working Japanese N64, one dead Japanese N64 and one dead USA n64 (some combining projects are just doomed to fail...), a half-dead 64DD, an Atari 2600 with joyboard and a Jaguar, Sega MD II, 32X and Saturn, DreamCast, Virtual Boy, a Phillips GX-somethingorother (`Satelite Attack` 0wnz), and my humble and as yet none-blowed-up-good NGC. And of course an XBox.
(well, okay, so that last one was a blatant lie).