Perhaps not as interesting as some of the above links, but Wikipedia also make lists of everything... They have an own category for native Linux games here, and an article related to that category here. There is also a decent download directory over at linux-gamers.net.
The sims 3 is listed under the win appdb as having some problems but it does run, under crossover games it is listed with gold status so it should run well. As this is a game for windows it is not native to Linux, so you will have to use a compatibility layer application to attempt to run it in Linux.
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http://indicium.us/cgi-bin/pages/get?view=unsung
Linux Games
Linux Gamer Guide
Linux Gaming World
TheAncientGoat wrote: Thanks for the LGDB link, I didn't know of that one :P
Allegro
Pygame
SDL games
GameHammerX.com