Dreamcast, Gamecube and PS2. Still using GC and PS2.

Console: Atari 2600, famiclone (NES broke), SNES, N64, Genesis, 32x (yes, I actually own a 32x), Sega CD, Dreamcast, ps1, ps2, XB.
Handheld : GB, GBC,GBA, Neo-Geo Pocket Color (still my favorite handheld, too bad it didn't get many good devs). ANyone else have one of those? Great joystick on the thing.
I use the ps1 fairly regularly (some RPGs like Xenogears and FF collection don't play well on ps2 and imports don't play at all). SNES and Genesis are mostly collecting dust. Ps2 and XB are also in regular rotation. I use the GBC for Final Fantasy Legend and Boktai.
@Alias - atari did an Atari re-release with A/V hookups and 30 games or something. I use it occasionally when I have company over, so you can probably play it on the bigscreen. You could probably do it anyway with an RF converter and an A/V switch.

I have my N64, a gameboy color, and a gameboy advance lying about somewhere...

Eh, maybe so, but the only reason I have it was because the guy insisted on a package deal when I bought the Sega CD. It really is an awful "system"/accessory. Dollar for dollar. probably the worst ever.

NES and Xbox. Though I got both of them after this console generation started. Before that it was all PC.

It was Sega stupidly trying to extend the life of the Genesis/MD but it did have some good games released on it. Star Wars Arcade and Doom were both brilliant as was Knuckles: Chaotix.

Console: Atari 2600(if it counts), Nes, Master system, Genesis, Sega cd, Dreamcast, Ps1, Ps2, xbox. I regret not owning a snes or N64 but I knew a guy that had them and used to get to play them alot anyway.
Handheld: Gameboy(chunky one), Gameboy advance, Gameboy colour, Sega game gear.
I have games for each system in about the 50+ range, except the gamegear think I only had about 20 of those.

Earliest consoles Ive got are a Gamecube and an Xbox which i realize arent very old. I do however have an original black and white Gameboy pocket and every generation of gameboy through the original DS (between me and my siblings).

I've had a quick look through all the boxes and this is what I have:
Amiga 500, Amiga 1200, NES, Master System, Gameboy Advance, Neo Pocket Color, N-Gage, N-Gage QD, SNES, Megadrive, 32X, MegaCD, Jaguar, Panasonic 3Do, Japanese Saturn, Dreamcast, Gamecube, N64, Virtual Boy, PSOne, PS2 Slimline, Xbox, Neo Geo CD. Oh and a Nokia N81 which is technically N-Gage 2. I absolutely hate the new consoles though so dont have any of them.

I have a PS2, and a couple gameboys, but nothing else. I used to have an N64, and a Gamecube, but I sold them, and the older consoles I don't bother getting because emulator softwares so easy.
The newer consoles, however, don't interest me at all. Gaming really has gone down the shitter recently, for the big titles at least. The only game I think I'd enjoy is Metal Gear Solid 4, because Kojima always does well, even when he's trying to make his previous fans hate him.

NES
NES model 2 (>_>)
SNES
N64
Genesis (& 32X & SEGA CD...love those bastards)
Dreamcast
PS2
Still need to get a 2600, and my awesome Saturn broke the same day I dusted it off. :((((

I would have had a:
NES (gave away)
Megadrive/Genesis (gave away)
Game Gear (as above)
PSone (sold it)
SNES (ex girlfriend spirited it away)
The only "old gen" thing I have is a PS2.
I miss my consoles.

I have a PS2, XBox, Nintendo 64, GameBoy Advance, GameBoy Color, and a SNES that I got at a garage sale. The more surreal kind of collection I have is in my MGS games. I have one copy of MGS, 2 copies of MGS2, and 3 copies of MGS3. This was done all by accident, but I chuckled to myself when I realized it.

I still have these classic consoles :
- Sega Megadrive II
- SNES
- Gameboy color, my good old gameboy had been stolen.
After that I discovered that PCs exists and that games released on them suited me better.