I still have my original x-box. Phantasy Star Online is one I commonly come back to, Castlevania: Curse of Darkness, NFL Street 2, Gauntlet: Dark Legacy, both Star Wars: KOTOR games, Baldur's Gate: Dark Alliance 1 and 2, Marvel: Ultimate Alliance (not sure if that is old enough to count for this but meh) Spider-man, Turok: Evolution, Star Wars: Jedi Knight: Jedi Academy
Blade, Castlevania: Circle of the Moon, X-men: Reign of Apocalypse, Spyro: Season of Flame, Metroid Fusion, Warioland 4 all for GBA had super mario world as part of Super Mario Advance 2 on my GBA but I lost that catridge years ago.
Super Mario World, bomberman 95 (93?) Super Metroid, Earthworm Jim (virtual console on Wii)
On my computer Unreal Tournament, the original Unreal, Diablo 1 and 2, Pool of Radiance: Ruins of Myth Drannor, Fable: Lost Chapters, Men In Black Deus Ex, sadly none of my mechwarrior games run on my computer. 4 might actually. . . Dark Reign 1 and 2.
X-com. UFO Defense, Terror From the Deep, Interceptor, Apocalypse, and Enforcer
Ok so most of my gaming. Most "recent" game I have is Torchlight from 2009 (not counting Divinity II: Ego Draconis since I was borrowing that from a friend)