I didn't vote, because it's a huge "depends" for me. There's several games I KNOW that I want immediately, so I get them on the day they're released. Rarely do I actually pre-order, but for some games, like Arkham City, having some really nice pre-order bonuses, I have to do just that.
Otherwise, I'll wait for reviews and what people say about the game.
If I'm not too invested, I'll wait until the price drops, but usually if it's a game I was already looking forward to, it'll be within the first week or two.
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~Halo Rolling around at the speed of sound.
http://img593.imageshack.us/img593/2417/sonicspeed.jpg