I'll play:
Atari 800XL & Atari 130XE (they take game carts), Megadrive (+ copybox), Sega GameGear, Nintendo N64, Atari Jaguar, NeoGeo Pocket Color, Sega Saturn (modded), GameBoy Advance SP (Famicom, NES & a normal blue one). PlayStation 2 (modded), XBOX (modded). Nintendo DS (US), Sony PSP (jap v1.50).
The GameBoy Micro Famicom is on its way from yesasia. I'm thinking about ordering a ceramic white PSP and will probably pre-order a XBOX 360 today or next week. I'll buy a black GBA SP backlit once they have 'm in the shops here.
Some of the older consoled I bought after the newer ones. I started with the Atari XL (after that I continued gaming on PC's and Atari ST's). Bought my first propper console, the GameGear, when in I was in the army for a year. Many years later after exclusive PC gaming I bought a PS2 when it was already 2 or 3 year on the market and after that started to buy the other consoles as they came out and collected the older ones.
(edited about 4 times)