We are major gamers at our house. You wouldn't guess it right off about me because I don't wear a lot of game-themed clothes and...I'm an English teacher. I play a ton of video games but I also read a LOT and I love Shakespeare.
I don't even know how many systems we have because my DH is a collector (has been since he was a little kid) and that means that we have a ton of random old stuff. We also have doubles of some systems because both he and I have one of our own from back when we were in college (for example, with Wii, PS2, DS, PSP, etc.).
Here's a list of what I can remember: Wii, PS3, PS2, PS1, XBox 360, XBox, DS Lite, DS, PSP, GameCube, Dreamcast, Sega Saturn, Sega Genesis/Sega CD, Virtual Boy, GameBoy, GameBoy Color, Turbo Grafx-16, Atari 2600 (I know we have another Atari system, too, other than that one), Commodore 64, Vectrex... I think that *might* be close to all of them, but I'm sure I'm missing something.
Both of us love music games...when we were dating, we'd go to the arcade to play DDR for a date night. We have a lot of bizarro imported Japanese music games like Beatmania IIDX, Guitar Freaks and Pop'n Music. I also am partial to platform games...Sonic CD is the best Sonic game ever created, by the way.
In our new house, we are creating a room in the basement specifically devoted to gaming and nothing else. It's somewhat scary. Hee hee.