Shinobi 3 on the Genesis
Chrono Trigger on SNES
Kid Icarus, Metroid, Zelda on NES
Bionic Commando on NES
Thunder Force III on Genesis
Gate of Thunder on Turbo Duo
Super Metroid on SNES
Blazing Lazers on TG-16
Sega Rally in the Arcade
Castlevania SOTN on PS1
Panzer Dragoon Saga on Sega Saturn
Gallactic Attack on Sega Saturn
Crazy Taxy on Dreamcast
Half Life series on PC
Dune II on PC
Supreme Commander on PC
Portal on PC
Cave Story on PC (free too!)
God of War 1 & 2 on PS2
God of War 3 on PS3
Wipeout HD/Frenzy on PS3
Uncharted 2/3 on PS3
...
This is a pretty big list! but I have been gaming for such a long long time... and I only put the games I go back to (or would go back to if I had an arcade for Sega Rally).