There's a fairly long line at my Best Buy right now...not nearly on the level of the wii launch but that's to be expected given its just one game. Certainly the longest line I've seen for a game, midnight or otherwise.
Did a midnight release at GameStop for it. Pre-ordered it during the day, and was out of the store by 12:10 - I lined up about 11:30ish. They really had it down.
Damn, it's good. I only could play the first couple of missions before tiring out (I have work ya know). But it's a great game so far. I'm going to see if I can get the rest of Liberty City open this afternoon, and just cruise around to study the map and locations of things.