Well, i have:
- XBOX 360 Arcade
- PlayStation Portable 1001(FAT).

I've had:
- PlayStation 2(Slim and Fat versions)
- GameBoy Advance.

I bought few months ago Nintendo Entertainment System(NES),but not in gaming purposes, but for PC modding purposes - i wanted to build some kind of NES computer, but right now i don't have time and money to finish this project.

No, I play only once in a while recently. Besides I like playing computer games and don't even imagine how to shoot (I like shooters mainly) with pad. And every Xbox game is at last ported to PC, with all the released addons and extra stuff unavailable for Xbox Though I'm considering buying DS. I like playing those funny Pokemon-like games in emulator

I have currently:

PS3 60GB.
Xbox 360 Premium 20GB.
PS2 Slimline.
Xbox1 (for XBMC)
PSP Phat 1001.
Nintendo DS
PSX.

Allright,

TV:
Commodore 16
Commodore 64
Commodore 128
Commodore Amiga 500
Nintendo Enterntainment System
Super Nintendo Entrentainment System
Nintendo Gamecube
Xbox
Playstation 2
Tetris TV-game (based on MOS6502 most likely)

Handheld:
Gameboy /the/ original
Gameboy colour
Gameboy advance SP
Nintendo DS
Playstation portable


I think thats it...

I once had a GBA, I have a fat and slim PS2 and a PC. Yes, a PC is a console!

TV connected Consoles :
Xbox
Xbox 360 (Premium 20GB)
Dreamcast
Sega Megadrive
Sega Master System

Handheld consoles :
PSP Slim

Let's see if I can do this from memory...

Atari 2600
Vectrex
Gameboy (original, colour, advance and advance SP(x2) )
DS (original, Lite)
SNES (x2)
Atari Jaguar
Neogeo Pocket Color
NES (x3)
XBox (x2)
Xbox 360
Sega Megadrive II + 32x
VirtualBoy
PSP(ieceofjunk) Slim
PS1
PS2
Dreamcast (x2)
Gamecube (x2)
N64
Sega Saturn

If we're counting computers...
Amiga 500, Amiga 1200 (x2)
ZX Spectrum +2
Main PC
AspireOne netbook
Second PC
Efika (yup. Cased up in an old NES too.)
Thinkpad R40

I have none. My only game friend, my PC.

Hmm i got

PS3
PS2 Slim
PSone
PSP
Xbox (3)
Xbox 360
Nintendo Gamecube
Nintendo 64
Super Nintendo
Sega Genesis
Sega Saturn
Sega Dreamcast

I plan on added an old arcade system to the mix soon. Either the Neo-Geo MVS arcade system or a Galaga machine.

I currently have:

Playstation
Playstation 3
Wii
Nintendo 64
PSP Fat

I'm planning on purchasing a PSP Go whenever it comes out, but that'll depend on how fast I can sell my Wii.

Apparently my "from memory" idea failed very hard. There I was, sitting playing Wii Sports Resort with the Wii Remote on the desk in front of me and what is the one damned console I forget to list? The Wii! D'oh!

I just have an old green gameboy color, which i haven't used a long, long time.
Besides that i just have my PC, which isn't a concole actually

PSP Slim & Lite (PSP-2004)
GameBoy Advance (I used to have also that big grey GameBoy, dunnow where it is now)
Super Nintendo Entertainment System
Sega Game Gear (somehow I managed it to loose all the games I had)

Playstation 1
Playstation 2
Xbox 360 (with the new preview update on it )
Wii
Gamecube
NES
SNES
Nintendo DS (like 3 of the old ones)
Gameboy Advance SP
PC (if it counts as a console)

GameBoy Pocket
GameBoy Color

I still remember how all my classmates wanted to play with my GameBoy Color during the lunch break. Miss those days.

I have Nintendo DS Lite
EDIT:and PS3

I have :
2*Amstrad CPC464
Tandy TRS80
Game&Watch Mario Bros
NES
Sega Mastersystem II
SNES
GameBoy (the first)
GameBoy Pocket
PS1 (SCPH-7502)
GameBoy Color
PSone
PS2 (fat)
2*GBA SP (black & tribal)
2*Nintendo DS (grey & blue)
PSP Slim&Lite (TA-085)
Nintendo Wii
Nintendo DSi (black)
EDIT : some added

Sega Mega Drive. (lol)
PS1
PS2
Xbox 360
and a Nintendo DS

I have:
NES
N64
Gamecube
Wii
Xbox 360
Game Boy Color
Game Boy Pocket
Game Boy Advance
Game Boy Advance SP
NIntendo DS
Nintendo DS Lite
Nintendo DSi
Sega Genesis
Sega Dreamcast

phew... that's all I can think of right now.

PS1
PS2
PS3
XBOX360 (RROD)
Nintendo 64
Dreamcast
Gameboy Color
Gameboy Advance
Wii
PSP (Original 1001 Version)
Nintendo DS (Original Silver)
and my PC

My PC beats all of them

I only really have my PC now a days - since moving out of home I left everything here.

So I have;

PC
DS
PSP (Broken... screen shattered, might get a new one)
Dreamcast
N64
Gamecube
Saturn (Don't know why I got this, I was going through a collecting consoles phase and picked one up for twenty quid)
Mega Drive

I sorta stopped playing consoles though, stuck to PC. Mostly cuz' I couldn't afford something like a 360 really but also because you know, try before you buy ;P

Yay! Got an Xbox 360 today.

I have
PlayStation 3
Wii
Gamecube
XBOX (old)
Playstation
Nintendo 64
Super Nintendo
Sega Master System
NES
Atari 2600 (Wood paneled 6 switch)
DreamCast

HandHeld
DS Lite (Limited Zelda edition Gold with Triforce)
PSP (original model)
GameBoy (original)
Game Boy Colour (Green)

PSP
PS1
PS2
PS3
XBOX
Gamecube platinum or whatever
PC
Pacman (arcade version, those big machines, you know)

Erm... I personally own:

PONG clone (from the '70s)
NES
SNES
Sega Master System
Sega Megadrive
Sega Megadrive II
Milton Bradley Microvision
Gameboy Classic
Gameboy Colour
Gameboy Advance
Gameboy SP
Gameboy Micro
Nintendo DS
A couple of "Super 8-bit" NES clones
and various other cheap electronic games like G&W ones, and Maplin's Pong clone.

Between them, the others in the family own:
PSX
PS1
PS2
PSPs
Gameboy Pocket
and a DS Lite

I also have a friend who recently bought an original Famicom from eBay.