Eugh, I probably have more than anyone else here just because of the gameboys. Here goes:
Nintendo:
SNES
Famicom
N64 x 2
Gameboy DMG-001 Red
Gameboy DMG-001 Green
Gameboy DMG-001 Yellow
Gameboy DMG-001 original
Gameboy DMG-001 Man Utd limited edition
Gameboy colour Dandelion x 2
Gameboy colour Grape
Gameboy colour Berry x2
Gameboy colour Lime
Gameboy colour Teal x2
Gameboy colour Atomic Purple
Gameboy pocket clear
Gameboy pocket pink
Gameboy pocket red
Gameboy pocket blue
Gameboy pocket green
Gameboy pocket yellow x 2
Gameboy Advance white
Gameboy Advance purple
Gameboy Advance clear blue
Gameboy Advance clear pink
Gameboy Advance SP AGS-001 Tribal
Gameboy Advance SP AGS-001 Pink
Gameboy Advance SP AGS-001 silver
Gameboy Advance SP AGS-101 Blue
Gameboy Micro Green
Gameboy Micro Silver
Gameboy Micro Famicom edition
Nintendo DS lite
Wii
Playstation
Playstation 2
PSP ceramic white
PSP slim black
Vita
Xbox crystal
Xbox 360
Megadrive
Nomad
Megadrive 2
Atari Lynx
Neo Geo pocket colour
Supergrafx
Core Grafx
Core Grafx II x 3
PC Engine x5
CD ROM2 x2 (currently non working) +IFU
Super CD-ROM2
PC Engine GT x2
PC Engine Shuttle
I've kind of gotten data fatigue now.. I probably have other stuff I'm forgetting...
Oh yeah, gamecube.. does a shooting watch count?