I know everybody is saying it's crazy to go early and wait if you've already pre-ordered, but I think what most people are worried about is Radio Shack/Best Buy not getting enough phones to cover all the pre-orders. I pre-ordered mine from Radio Shack but you bet your arse I'll be there first thing in the morning before they even have a chance to call me to pick mine up. I've been waiting for this phone for too damn long already and I'm not about to wait another 2-3 weeks for one if for some reason they don't have enough to go around.
The last time I waited in line for anything was when Star Wars Episode II opened in theaters, and I camped out with some friends for a couple days prior. Yeah I'm a nerd, whatever. I'm a cool nerd though.
I'm thinking maybe the lines won't be as bad as people think, because it seems Sprint users are still the minority among cell phone users, but still I'm not taking that chance. There may not be as many Sprint users as AT&T or Verizon, but I think EVERY Sprint user wants this phone.