There are some games I keep going back to play. I even have a specific area on my computer desk where I can keep these. The rest of the games just gather dust and are never opened. Then there are games I have a fond memory of, but will very likely never play again. I just love lists, so here's the list.

Games I keep close by:
Civilization IV (including the two expansions)
Madden NFL 06 and 07
NHL 04 and 06
NBA live 05
Oblivion (including the expansion)
Morrowind (including the two expansions)
Pro Cycling Manager 06
X3: Reunion
Pro Evolution Soccer 06
Two Worlds (the game I actually play online the most)
Gangland
East Side Manager 05 and 06
Defcon (almost on the way to the dust gatherers)

Spore has already found its way to the dust section. It was fun for about three weeks, but it gets repetitive. Similarly this happened to Scarface, fun sure, but too repetative for my liking. Mind you, I don't mind having to do the same things over and over again, but when the tasks become annoying to complete and the only way to get something I quickly get fed up.