Soon there will be a:
Five Guys (opened a few years ago)
BGR (opened late 2009)
Rogue States (opening early 2010)
BLT Burger (opening Spring 2010)
BLT Burger is really, really good (at least the one in Las Vegas is). It is way better than BGR -- much better shakes and better burgers. BGR does have some really neat stuff on its menu (tuna, lobster) that could help it stand out. Five Guys serves its niche, and will be much cheaper than BGR or BLT. Rogue States won't last long if the burgers aren't dynamite.