hmm, i think i remember them all, some are packed up:
NES(gone through about three of them over the years XD)
SNES
Virtual Boy
N64
Wii
Game Boy(old gray thing still works XD)
Game Boy Pocket
Game Boy Color
Game Boy Advance and SP
DS(not lite)
PSone(old gray one)
PS2(both slim and original XD)
PSP
GBA, which i rarely use
PC, with game console emulators like PS1 and GBA :P ; nice specs, standard gaming platform... for year 2002... but it plays the cell-shading 3D hentai game SchoolMate by Illusion quite well (i read that some people had single-digit framerates with it)
if there's something that i used to own:
GB Color (gave it away)
PC's (old Intel Pentium 1 processors and i even had an Intel 486)
Nintendo Family Computer (makes me nostalgic, lasted for at least 10 years before it mysteriously broke)
some old LCD no-bit hand-held brick games (is that even counted?)
Dreamcast
Super NES
Gameboy Color
Gameboy Advance
Gameboy SP
PSP/DS (me and my cousin share whenever we see each other)
PS2
Wii (not mines but its in my apartment) xD
PS2
XBox 360
GameCube
PSP
Super Nintendo
My PC with my two emulators :)
Systems I have owned in the past...
Game Boy
Game Boy Color
Game Boy Pocket
Game Boy Advance
Nintendo DS (not the Lite version)
Nintendo
PSX/PSOne (really no difference lol)
XBox
Numerous LCD games
Game and Watch Tetris