Valve announced that Counter-Strike: Source Beta pre-loading has now begun for eligible Steam users, expanding the Beta beyond its initial release in cyber cafes. The wider-release beta will be active for play on Wednesday.
Who are these lucky eligible gamers? Owners of Counter-Strike: Condition Zero and those who purchased the special ATI/Half-Life 2 bundle should be able to participate in the beta through Steam. Of course, it's worth checking at the
official site for all the details.
Source : IGN