I spoke with an AT&T rep yesterday and only CORPORATE stores will have iPhones. And some of those wil not have them for release on Friday. So I am going to stick with the Apple store and since I am already an AT&T customer
I'll be able to put my sim card in and go.
Do you think it is really goining to necessary to "camp out"?

There is a Corporate AT&T store near the Mall of GA (Buford, GA)
I have just called them and they are closing the store at 4pm and will reopen at 6pm to begin sales! They will have a limited number of phones available (obviously) I think I may go there in the morning on Friday. The guy says they have not released whether or not there will be a discount with a 2-year contract or not...
good luck