Linux

Game4Linux
Gathers links for games that play under Linux. Each game can have its own freely editable page using a wiki. [English/French]
http://www.games4linux.eu/

Linux Gamers' FAQ
Answers to common questions pertaining to Linux games and gaming.
http://icculus.org/lgfaq/

Linux Games - MobyGames
List of Linux games including screenshots and box covers.
http://www.mobygames.com/browse/games/linux/

Loki Installers for Linux Gamers
Installers for native and WINE-enabled titles. News, FAQ, forums, and executables.
http://www.liflg.org/

Online store for linux games
Tux Games is specialized in supplying game software for the GNU/Linux computers
http://www.tuxgames.com