Last year I attempted to buy and activate a 3G on launch day. After almost 5 days (read: 5 DAYS) neither ATT nor Apple could get it activated (and by the end each said it was the others' problem). I returned the unit never having been able to use it.
I try again this year with 3Gs I am hoping for better luck! It appears per fedex to be waiting for me at home, I might wait til Mond or Tuesday to activate just to be safe since Apple servers (once again) are not up to the task.
It's AT&T servers that would be a problem, not Apple. Apple does not activate phone service as they are not the service provider.