Let's see here...
Atari 2600's:
'Heavy Sixer' 2600(x1) if I can find it
'Darth Vader' 2600(x1) I'll refind it one of these days, instead of wood grain, it's all black with silver lettering on the front
'standard 4 switch' 2600 (x
Many), at least one with box
~100 carts
Accessories: many Atari paddles, many Atari joysticks (most in not very good shape), Atari Trakball, lots of third party controllers
NES:
Nintendo Entertainment System (x5?) A few box variations are in a closets. Sports NES (came with NES Satalite and Techmo Bowl), at least one Family pack.
>50 carts
Accessories: Many NES controllers, NES Four Score, NES Satalite, NES Advantage Joystick, several third party controllers.
Sega Genesis:
Sega Genesis 1(x2)
Sega Genesis 2(x2)
Sega Genesis 1 with Sega CD 2(x1 huge console)
~10 Genesis games (all Sonics except 3D, plus other games) ~10 Sega CD
Accessories: Serveral 3 button joypads, two Sega brand 6 button pads with autofire, a couple of third party 6 button pads, Lethal Enforcers gun, and a gun that is switchable between working as a Sega Menacer and a SNES Super Scope
Other consoles:
SNES(x2) about 10 games
Atari 5200(x1 4 port, x1 2 port) with about 5 games and trackball controller
Coleco Vision(x2) about 12 games
X-Box(x1) with 7 game discs (3 are multi-game) and lots of demos, DVD remote
Dreamcast(x1) with 8 games and lots of demos, lots of accessories, including the Broadband adapter
Playstation (x1 7500 model, x1 9000 model) with 8 games and lots of demos
Portables:
Sega Game Gear w/ Master Gear converter
Orginal Nintendo Game Boy
Mattle Game.com
Bunches of single-game LCD games
A few LED games
Dell Axim X5 PDAs(x1 400MHz/64MB,x1 300MHz/32MB) that I play emulators on
Computers:
Atari 400 with about 10 games
Apple IIe with the standard expansions, with about 20 pounds of disks
Apple IIGS(x3) Rom 3 1MB models, three diskette holders of 2GS disks and the IIe disks.
TI-99/4A(x3 silver/black) around 30 carts, speach synth, TI-Cassette
TRS-80 COCO 2
TRS-80 PC-210 with plotter/expansion module
Comodore 64(x1) with disk drive and monitor, 3 diskette holders of games and apps
IBM PC 5150 (the orginal PC)(x1) dual floppies, almost as much software as the IIe
IBM PC/AT 5170
Several XT clones
Lots of Pentium class PCs, including one that has a heatsink that plays a tune on bootup
100lb+ Dual Pentium II Compaq rack mount server w/512MB of ECC EDO RAM and a Raid 0 of two 2.1GB SCSI drives (thinking of grabing a couple 73GB 10K RPM drives for it)
A cobled together Dual Pentium II 400 with 128MB SDRAM RAM and 10GB IDE harddrive in a mid-tower
Socket 370(x1 Celeron 366, x2 Celeron 400) slimline systems (slightly bigger than a Pepsi fridge pack)
Of course my ultra-portable (PCp) will be joining this list soon
My Main PC:
Athlon XP 2600+, 333FSB (gift from a friend, I bought him a Game Cube and the popular games later on)
512MB of DDR RAM (also gift from the above friend)
Epox 8rda+
Geforce 4Ti 4200 Golden Sample VIVO
160GB Maxtor drive
60GB Maxtor drive
8x4x8x32x12x DVD/CD writer
Held in an Aero Cool case (looks it has a jet engine with it's 120mm ducted intake)
Running Gentoo Linux (or possibly KUbuntu soon)
Arcade:
P.O.W., Dynamo HS-2 cab with 19" rotatable monitor
Boards:
P.O.W. (of course) with hi-res PROMs
Mortal Kombat
Street Fighter II: Hyper Fighting (bad combo RAM

)
Bad Dudes vs. Dragon Ninja
Aero Fighters
Though you can't tell from the list, I perfer vertical shooters. The reason I only have one is that they tended to go for a lot of money when I was looking(over $100).
MAME:
J-Pac and ArcadeVGA from Ultimarc.com, need to get a dedicated PC for MAME still.
Pictures of some of it:
http://videogamecollectors.com/gallery/Tom61