Systems: 2600 (Sears 4-switch and Vader 4-switch, both are broke), Gameboy (original white), Gamegear(light gray, black, and blue), N64 (standard black), Gamecube (purple and silver), PS2 (silver slim), Dreamcast (standard white), Neo-Geo Pocket Color (silver), Gameboy Advance (red), Gameboy Advance SP (Who Are You? edition) , N-gage QD, DS lite (black of course)
2600: over 100 games, rarest ones are: H.E.R.O. Pigs in Space, Taz, and Fast Eddie.
Gameboy: about 10 games, rarest ones are: GTA, Metroid 2, and JOSHUA: BATTLE OF JERICHO!
Gamegear: over 150 games, rarest ones are: Indians Jones, Sonic Labyrinth, Super Space Invaders, Earthworm Jim, and Fantasy zone.
N64: around 120 games, rarest ones are: Majora's Mask gold hologram, Mario Party 3, and CONKER'S BAD FUR DAY!
Gamecube:around 50 games including: Chibi-Rovo, PN03, Zelda Compilation, and BMX XXX!
PS2: only 10 games, the rarest one is Grand Theft Auto Trilogy
Dreancast: only 7 games, but one of them is MARVER VS. CAPCOM!
NGPC:16 games, no idea which ones are rare
GBA: around 30 games, rarest ones are: and Pokemon Blue Sea Edition, Grand Theft Auto, and BOOKWORM!
N-gage: 33 games, the rarest one is Xanadu Next
DS: 20 games, and I have no idea which is the rarest, but Devilish, FF4, and Trama Center: Under the Knife 2 are in there.
Thats my collection, as you can see I have consoles I collect for and Consoles I actually play. Still, nearly 550 games!