In the order of which they were released:
In-Television (remember that one?)
Atari
Nintendo
Super Nintendo
Sega Genesis
Playstation
Playstation 2
XBOX 360
I have all of them somewhere. I have the NES, PS2 and 360 hooked up though.
My roommate and I in college had the following collection, though we don't have a lot of them anymore.
Atari 2600
Atari 5200
Sega Master System
NES w/ Aladdin add-on
SNES
Sega Genesis
Sega CD
Sega 32X
Panasonic 3DO
Atari Jaguar
Sega Dreamcast
PS1
PS2
Xbox
Xbox360
Gamecube
N64
Neo Geo Pocket
Atari Lynx
Gameboy
Gameboy Pocket
Gameboy Color
Gameboy Advance
Nintendo DS
Game Gear
I own all of them since 1972 except for a Sega SG-1000 :( If anyone knows where I can get one for around $200 let me know. Rare consoles are so expensive .