http://steamcommunity.com/groups/tradingcards
It's in beta. To get in, join that group and they will send a beta invite. Although from what I hear it's going live / full release soon?
Also, read this: Trading card FAQ
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Whats with those Steam Cards?
How do i activate this feature for my Steam Account?
Where do you sell them?
How do you get them?
Thanks ^^
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