NES
SNES
N64
GC
GB:SP
XBOX
NDS

(And waiting to purchase a Wii360)

'89 NES
'91 SNES
'92 Sega Genesis
'?? GameGear
'96 N64
'01 GCN
'04 PS2
'07 Wii

Favorite - probably SNES or N64, Wii will probably overtake this once some really good games come out.
Least - GameGear

 Edited to add PS2

1. Game Boy
2. SNES
3. Genisis(Brothers)
4. Playstation
5. Playstation 2(Roomates)
6. Dreamcast
7. GBA
8. Wii
9. Nintendo DS
10. Xbox 360

I have loved all the concoles I have had. Most recently I have been playing my Xbox 360 as I have only had it for a little over a week. I am still waiting for a new title that can really hold my interest on the Wii though I do still love playing it with my wife who has never played video games before I got it.

I personally have owned:
Game Gear
SNES
GBA
Gamecube
PS2
DS
Wii
PS3

My family/brothers owned:
Atari 2600
NES
Gameboy
Genesis (+ 32x/SegaCD)
Saturn
N64 (I didn't get to play this much since it was my brother's and he was in college)
Dreamcast

Hmmm...approx timeline, memory is fuzzy

some old Philips console, G7000 I think
Spectrum 48K
C64
Amiga
Sega Mega Drive
SNES
Xbox

My own systems.

Atari 800XL
Atari 2600
386 25Mhz (PC) (I remember changing emm386 memory stacks to get games to work :) )
P120Mhz (PC)
P2 300MHz (PC)
A 1700+ (PC)
A 3000+ (PC)
Wii

--Played around friends houses--

Saga Master System
Saga Mega Drive
Commodore 64
Amiga
Pong with paddles(!)

1. Atari 2600
3. NES
4. SNES
5. N64
6. Gamecube
7. Nintendo DS Lite
8. Wii

1. Atari 2600 (from parents)
2. NES 3x (from parents, from grandpa, & from neighbor's used)
3. Gameboy 2x (mine and older brother, from parents)
4. SNES (from parents)
5. Genesis 2x (regular & genesis3, first from parents, second bought myself)
6. Gameboy pocket (younger brother)
7. Gameboy Color (youngest brother)
8. Nintendo 64 (from parents)
9. Sega Saturn (used)
10. Playstation (bought myself)
11. GBA 2x (both younger bros)
12. Dreamcast (bought myself)
13. Tyger Gamecom (bought myself, sucks)
14. NeoGeo Pocket (younger brother)
15. Playstation 2 (bought myself)
16. Gamecube (bought myself)
17. DS 2x (both younger bros)
18. DS lite (bought myself)
19. WII (bought myself)

 Plan to buy a 360 soon, mostly to be able to play XBox games
since I never had an XBox and have only played XBox a few times.

1. NES
2. Game Boy
3. TurboGrafx-16
4. Game Gear
5. PS1
6. Game Boy Advance
7. Nintendo DS
4. PS3

I'm only counting systems I got when they were still "new". e.g. I got a Virtual Boy for $15 when someone found an old box of them at Walmart, and systems that were obsolete when I got them, like the Master System, Genesis, Atari 2600, etc.

After getting burned on the TurboGrafx-16 (it was pretty expensive with the CD addon, didn't didn't get many games, then NEC pulled out of the market), I was wary about buying new consoles. I got a PS1 after the popularity was pretty well established. Then for some reason I decided to get a PS3.

Hopefully the TG16 isn't a bad omen for my PS3 (expensive system with slower, yet massive game storage made by a large electronics Japanese manufacturer, much more popular in Japan than in the US).

Then again, it could also be good if I compare the TG16 to the 360 :) (inexpensive Core system with expensive addon for the additional storage medium, made by a company inexperienced with gaming, released a year before the Nintendo, which was the last to market and pulled way ahead of the others :)

Am I the only one who started with a generation 1 console...

1 Magnavox Odyssey 3000 (well, it was my dad's)
2 Atari 2600 (Pitfall!)
3 NES (Zelda)
4 N64 (Super Mario 64)
5 Xbox (Kotor)
6 Xbox 360 (Mass Effect, hopefully :) )

Well, I liked the NES best because of it's extensive game library, the n64's library sucked!

Also got c64, amiga and PC.