Counter-Strike: Source Guest Passes Available
Valve let us know that guest passes are now available for Counter-Strike: Source owners. Should you have friends who don't have the game, you can now invite them to play the full game for 3 days. Obviously they will need to install Steam to use their guest pass.
From The Chatty
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awesome! will i be able to send the same friend more than one invite? or will it just be that one time?