Check out this post from The Unofficial Apple Weblog (TUAW):
"Among the methods featured in the document to help ease the situation and control the crowd, is an outline of a mock conversation where AT&T store managers explain to the stores near them why they need to stay open late and what steps they will be taking to help ensure the crowds don't spill into the surrounding stores and do all kinda damage. The document also reveals the super-secret method that will actually accomplish this miraculous controlling of the crowd. What is this miracle you may wonder? Stanchions. Yes, the proverbial "velvet rope" they use to keep people in line at events across America will be standing guard and providing security for the giant iPhone launch event."
(from: iPhone Crowd Control)
Can we just get a life already?