Via Opposable Thumbs, a post on the Consumerist site notes that some enterprising gamers who bought the Orange Box in a territory different than the one they lived (to save a few bucks) have now found themselves unable to play the game. "One user, Todd, explains that thousands of crafty North American gamers looking for a deal have 'bought the product (and hence, the serial numbers) at well known international game stores' at a significant markdown. Activation of the purchased titles went off without a hitch. However, Valve apparently has taken issue with the region-specificity of some international versions and has begun locking out accounts of those living in North America, but owning international serial numbers with the message that the purchased game is in the 'incorrect territory.'" Worse, folks who tried to 'make it right' by buying a local copy have found they're basically SOL. I've been a big fan of the Steam concept since it launched, but this is the sort of thing you need to communicate to your users before you sting them.