-Sega Megadrive (1991 I guess, though I started playing in 1993-94)
-Playstation (1997)
-PC (1996/1997, when I started playing PC games)
-Playstation 2 (2001)
-Gamecube (2004)
-X360 (2006)
-Nintendo DS (2006)
-Wii (2006)
-Ps3 (2007)
-Xbox (2009)
-Nintendo 3DS (2011)
I've never owned an N64 and a SNES but me and a friend of mine used to swap consoles for a month about 1 or 2 times a year, so I played a lot on those too.