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Happy Birthday to Steam as it turned 20 today
(www.gamingonlinux.com)
Steam is a video game digital distribution service by Valve.
Steam News | Steam Beta Client news
Useful tools:
SteamDB
SteamCharts
Issue tracker for Linux version of Steam
Actually if you have/create a battle net account, you can register your CD key to your account, and then they have a downloadable installer for starcraft and Diablo. 2, and other old games.