An AT&T store in downtown Washington, D.C., has its ordering system crashed between 10:30 a.m. and 1:30 p.m. ET. During that period, the store's employees took orders on paper for about 100 customers, which they began entering into the system manually in the late afternoon after the system came back to life. If there are any shipment delays, those early-birds would, ironically, receive their iPhones after the stragglers.
Basically if you went to At&t and stood in line for the employees to hand write your info to pre-order an iPhone 4, you may not get it until after the 24th.
Here is the link for the whole story.http://money.cnn.com/2010/06/15/technology/iphone_orders/index.htm?cnn=yes