Going to be a little crazy and get there at 6:30, I'm not so much worried about not getting one if I showed up later, but I'd rather spend most of my day at home with my iPad than standing in line waiting.
For 3GS I got there at 5am, there were 10 or so people already there, and by the time I was walking out of the store at 9:30-9:45 the line behind me had grown to 100 people, if not more.