1. ADAM PC
2. NES
3. Atari 2600
4. Macintosh IICI
5. GameGear
--- Didn't own any systems during the SNES/N64 Gens, But I had friends who did ---
6. Gaming PC Rig
7. GBA
8. GameCube
9. PSone
10. PS2 rev 3 - died-

11. GBA: SP
12. SNES
13. Genesis
14. PS2 rev 9 -died-
15. DreamCast

16. NeoGeo Pocket
17. Xbox
18. N64

19. GameBoy

20. GameBoy Color
21. PS2 Slim
22. Nintendo DS
23. Xbox360 -died-
24. VirtualBoy
25. PSP
26. Wii
27. Xbox360

Liked the most: SNES

Liked the least: VirtualBoy

Current-gen fav: Wii

Current-gen least fav: PS3

nintendo

super nintendo

genesis

saturn

playstation

64

playstation 2

gamecube

x box

wii

ps3

yup...thats the order..i tink 

i forgot to throw the handhelds in there...i had a psp after i got the gamecube...a gameboy somewhere after playstation 2....gamegear like in 1789....sometime around that year...but ok im sure im leavin stuff out!!!

1. Atari
2.Sega Master System 2
3.Sega Megadrive 2
4.Nintendo 64
5.Playstation 1
6.Playstation 2
7.Wii

Wii and the Nintendo 64 are my personal favourites

Atari 2600
NES
Genesis
SNES
Playstation
Wii

Liked the most: SNES/Genesis. Tough call.

Liked the least: Playstation. Not that I didn't enjoy it, though. 

I skipped the PS2/Gamecube generation. Along the way, I've always been a PC gamer. As for portables, I stopped after the first Gameboy, then picked another one up only now, a DS Lite.

1) NES
2) SNES
3) Mega Drive (Genesis)
4) Game Gear
5) N64
6) GBA
7) Gamecube

I quickly sold the GBA, because of the horrible screen and cause most of the games were SNES ports. So that has to be my least favourite, though I hardly played the SEGA ones, too.
Favourites: The rest :)

1) Gameboy pocket: ~1995. (With pokémon Red, bought blue and yellow in 1996).

2) Gameboy color: ~1998. (With Zelda: Oracle of ages and oracle of seasons)

3) Nintendo 64: ~1999/2000. (Crystal blue version with Mario 64 and Goldeneye and Zelda: OoT).

4) Gamecube: ~2003. (When Zelda: The windwaker and Mario kart: Double dash came out).

5) Nintendo DS: ~2005. (March 2005 With Mario 64... Again And Metroid hunters).

6) Nintendo Wii: ~2006. (8 days after EU launch, with Zelda: Twilight princess ofcourse).

Liked the most: Gamecube; still play it most of the time! Especially Timesplitters: Future perfect, that game is just HUGE! I'm in it for like 230 hours... And at 70%. I STILL enjoy the multiplayer with friends! Who all own it too!

Liked the least: None... However. I don't play on my Wii now. Only for Gamecube games! And sometimes mario strikers charged...

Me = Nintendo All the way!

1989 NES
1990 Game Boy
1992 SNES
1998 Game Boy Color¨
1999 Nintendo 64
2002 Game Boy Advance

2002 Gamecube
2005 Nintendo DS
2006 Nintendo DS Lite
2006 Nintendo Wii

Atari 2600 - that was the don! all about Space Invaders. although i did have Madden, but could never work out how to play it!

Sega Mega Drive - Sonic, Alex the Kid, Golden Axe and Altered Beast!

GameBoy - er... tetris anyone? and Worms!

GameBoy Pocket - got it free for opening a bank account

N64 - Or the GoldenEye machine as it became effectionately known

PSOne - still have my games for it - all get played on the PS3!

GameBoy Advanced - great, except you couldn't play it in the dark...

Xbox - got given one that didn't work, so bought a new DVD drive for it and hey presto! a summer's worth of Halo and Star Wars - how i love my FPSs

PSP - wish there was a good FPS worth buying, now use it for watching movies and listening to music. and as a portable photo album.

PS3 - wish there was any game worth buying... ok, being a little harsh, it's awesome. had it since launch and i'm still finding out new funky things it can do!

I'm including the consoles my roomies owned in college because I played them a bunch:

1. Atari 2600
2. Atari 5200
3. NES
4. Gameboy
5. Genesis
6. N64
7. PS1
8. DC
9. Xbox
10. SNES
11. PS2
12. Gamecube
13. Nintendo DS Lite
14. Wii
15. Xbox 360

I'm not including PCs on this list... Too confusing to track updates to hardware.