I had my uncle log into my Steam account and purchase HL2 for me the night before last. Unfortunatly, you can't use one credit card to buy two of the same package to prevent fraud.
@_@
He bought Silver on his account, then bought it on mine, and I can't play it because of fraud protection. And now the "Browse Games" function isn't working so we haven't been able to use another card. Apparently you can buy it from the Steam Powereed mainsite...I'll try that tonight if Browse Games doesn't work.
BUT, before the purchase was processed and thus refused, I got to play it for a few hours. Awesome game.