I have to go to work immediately after, and there is no iTunes or working USB ports on our computers. Will AT&T set-up my iPhone so I can use it tomorrow and download from the app store?
If you buy it in any retail store, they should activate it for you before you leave.
It used to be that you had to take it home and sync it to iTunes before you could purchase anything, but 3.0 is supposed to have the ability to sign into the iTunes Store directly from the phone itself.
I have to go to work immediately after, and there is no iTunes or working USB ports on our computers. Will AT&T set-up my iPhone so I can use it tomorrow and download from the app store?
In Store activation unless the servers go down and then they will send you on your way with an iBrick until you can connect and complete the iTunes activation.
Do you have an iTunes account, if not set one up now to save you time tomorrow.
If the server goes down, it goes down for everyone, Apple included. So hopefully they won't have that issue! Last year they released the new firmware on the same day, so there were tons of people activating with their upgrade as well. By staggering the release there should be less of a strain.