It was my understanding that Steam had a new feature where I could trade games I never opened. I tried to do it and no games were listed as available for trade. Is it not implemented yet or did I screw something else up?
Doesn't really have anything to do with whether you "opened" anything. If it's yours, on your account, you can't do anything with it. If you buy a game specifically to be a gift, you can trade that. If you buy a game that comes with a game you already own, in some cases that second copy becomes a gift copy. If you buy four copies of something for friends, those are gift copies, etc. Just cause you haven't played something doesn't mean you can give it away.