I currently have the following:
Nintendo Gamecube (currently in loft)
Sony PS2 (currently at my folks house so I dont know if it counts)
Sony PS3
Nintendo Wii
Nintendo DS
Amiga 600 (dead and in loft - it will live again if i get my way!)
Amiga 1200 with kickstart 3.1, 127mb hardrive (originally installed by Commodore so my warranties are not void...oh wait)
Jeez I just noticed the lack of Microsoft...Ah well, i'm sure Mr Gates will survive without any of my cash for the time being!