Heres mine. (please note ROMS dont count)

SNES (before it got stolen)

Super Street Fighter 2 Turbo
Chrono Trigger
Ranma 1/2 Japanese import (2nd best SNES fighting game)
Mortal Kombat 2
Megaman X
Legend of Zelda: Link to the Past
Super Mario World
Blazeon (good RType space shooter style game)
Super Mario Allstars

PSX-

GTA 2
Final Fantasy VIII
Final Fantasy VII (Disc one is missing)
King of Fighters '99
Megaman X4
Capcom Vs SNK Pro
Silent Hill

Dreamcast-

Street Fighter 3: Third Strike
Street Fighter 3: Double Impact (2 games in one, Street Fighter Next Generation and Street Fighter 3: 2nd Impact)
Capcom Vs SNK
Plasma Sword
Sonic Adventure 1 and 2
Tony Hawk 2
Seaman
Guilty Gear X (Japanese version)
Ecco the Dolphin
Sega Smash Pack (about 12 games)
Carrier
Unreal Tournament
Quake 3
Time Stalkers

PC

Doom 2
Final Doom
Unreal Tournament
HalfLife
Serious Sam
Diablo II: LOD

Gameboy Color/Advance SP

Pokemon Gold and Silver
Street Fighter Alpha 3
Zelda: LTTP
Yu-Gi-Oh: Eternal Duelist Soul
Dragon Ball Z Collectable Cardgame
Tetris
Final Fantasy Tactics Advance