Beta will be extended later for owners of Condition Zero and ATI bundles.
Valve informed VGLN.com today that Phase 1 of the Counter-Strike: Source beta has opened at cyber cafes that subscribe to the Valve Cyber Café Program. A full listing of those venues can be found here: http://www.steampowered.com/?area=cafe_directory
Later this month, the beta will be extended to owners of Counter-Strike: Condition Zero and ATI\Half-Life 2 video card bundle owners.