wvpr: What happened to the button showing you that you already have a copy of a game in your library? Now the fastest way to check is to add a game to the cart and see if it gets the "has to be a gift" message during checkout. Am I overlooking something?
During previous sales, GOG has disabled the "Owned" function for reasons of performance, because it is quite "heavy" in terms of database traffic (the site has to check each game against your user account to see if you own it or not), and with the massive increase in general site traffic that a major sale generates, their servers can't keep up.