1. SNES
2. N64
3. Game Cube
4. GBA SP
5. Xbox
6. Nintendo DS
7. Wii
8. and eventually Xbox 360

Like the most: Xbox

Like the least: GBA SP

(All systems new and American except as noted)
01.NES (1988)
02.Game Boy (1990?)
03.SNES (1991 or 92)
04.Game Gear (1992?)
05&06.Genesis & Sega CD (1994?) (got as a package)
07.N64 (1996)
08.[PlayStation (1996) (my brother got for Xmas)]
09.GB Pocket (1997?)
10.GB Color (1999?)
11.PSone (2001)
12.Gamecube (2001)
13.GBASP (2003?)
14.Wonderswan Color (2004) (got it cheap, used it about once, don't remember its nationality)
15.DS (2004)
16.Dreamcast, used (2005)
17.Xbox 360 (2005) (preordered thru friend's Activision employee deal, didn't get it till Xmas)
18.DS Lite (2006)
19.Wii (2006 launch)
20.PS3 (2006)
21.Saturn, used (2007)
22.Japanese SNES, used (2007)
23.Xbox, used (2007) (for total backwards compatibility)

Total: 19 (extra versions of PS and GB don't count) -- and none of them have ever given me trouble except the NES, 1988-2006 RIP

Yeah, that's right, NO PS2!!! I just somehow never got around to doing it, and now that I have a PS3... And no Xbox till yesterday either -- I had a rich friend who loaned me his for like 4 months while I plowed through Halo.

As for my favorite: well, I guess that depends how we count it. Right now it's the Wii; counting backwards compatibility and VC it's unstoppable even by the PS3. But if it's the favorite of all time as measured by my enjoyment of them at the time, it would have to be the SNES.

As for my least favorite: Wonderswan Color is the easy way out. Other than that? I dunno, I never got much use out of the GBColor...but I don't even know if that should count as a whole system. Pretty much the only GBAdvance game I ever played was FF Tactics Advance, so that's a good candidate.

1) Atari 2600 technically
2) NES
3) Genesis
4) N64
5) Dreamcast
6) Gamecube

I feel sad that the Intellivision didn't get more love. Oh well, it will be remembered fondly in my apparently aged brain.

Anyone who owned a Dreamcast and has it as their least favorite is getting banned...(I'm kidding...or am I?)

1. SNES (1994)
2. Gameboy (1995)
3. N64 (1997)
4. Playstation (1999)
5. Genesis (1999)
6. NES (1999)
8. Dreamcast (2000)
9. GBA (2001)
10. Gamecube (2001)
11. PS2 (2004)
12. Xbox (2005)
13. DS (2005)
14. Xbox 360 (2007)
15. Wii (2007)

Favorite - N64. God knows how many hours I played zelda, goldeneye, banjo kazooie and all the others.

Least Favorite - 360 so far. Play a bit at college, but after gears of war hasn't gotten much attention.

My favorite is probably dreamcast. It had the most charm to it. Least favorite was probably the Atari, though I never really played it too much (as i was like 4). But looking back, I'd probably like the Atari too.

1. atari 2600
2. nes
3. gb
4. snes
5. master system
6. megadrive
7. n64
8. playstation
9. dreamcast
10. gba
11. ps2
12. gamecube
13. xbox
14. ds
15. psp
16. wii

i also got a mega cd and 32x somewhere in between my gba and xbox but i have since sold them on. they are easily the worst machines ive owned especially the 32x. AWFUL!

However since i dont own them anymore i wont include them.

fav: n64. close second places go to nes, snes, ps2.

least fav: halo, whoops i mean xbox. i own 4 games on it and you guessed it 2 are halo. i dont hate the machine but i thought it never reached its potential and had far to many shooters on it. this is also the main reason why ive yet to buy a 360, for me its going down that same road. a close second for least fav is the dreamcast, again i didnt hate it, but looking back most of the games i have for it have been released for ps2 etc so its become abit of a redundant machine in my collection.

1. Snes
2. Gameboy original
3.Genesis
4. Gameboy pocket
5. N64
6. Gameboy color
7. ps1
8. Gamecube
9. ps2
10. Wii
11. Ds lite
12. Xbox 360

Mmmh those are all I can remember.

Favorite: Its a hard decision but i think it was the gamecube only because of SSBM, yea i totally loved that game. (Or it can be the Wii since now I play SSBM on the Wii). But once SSBB arrives my fav console of all time will be the Wii.

Least Favorite: I cant choose any, I liked all really.

I'll go newest to oldest just cause =p

PS3
PSP
PS2
N64
PS1
3DO
GBA
SNES
Genesis
NES
TurboGrafix16
Atari 7800
Texas Instruments system(did ANYONE else have one of these?)