In no order other than age...
Nintendo Entertainment System NES
SEGA Genesis (no special attachments)
Nintendo 64 N64
Gameboy Color, its somewhere...
Gameboy Advance, 3 of em and a half, one was literally broken in half
Gameboy Advance SP, 5 of them, one for the whole family :D
Nintendo Gamecube
Nintendo Wii
Nintendo DS lite, 4 of them
Now to the complicated section...
1 really old desktop, you know the old computers where there's green letters and that's it?
1 old labtop, I believe the thing is 10 years old
1 slightly old desktop, I believe its 6 or 8 years old
1 new desktop, top of the line during the date of Dec 2008
1 unknown desktop, got it at a garage sale for 10 dollars, never turned it on
1 burnt desktop, left in the attic for 5 years and the screen is very blurry
2 600$ labtops, on sale, I mainly use one to hold a lot of movies, videos, other saveable things
1 2000$ labtop, I believe it was bought in 2006 x-mas, it can run almost anything, and I abuse it to the max :P
1 new labtop, gotten last year, this is my brothers and I have no idea what it can do other than really assist him with art
and finally my labtop where I am posting this from, apparently it is a top of the line gaming labtop for July, I got it as a birthday present.
I have reason to believe there are several Atari's in the basement but I have never bother to dig through all the junk down there to find them.