We feel your pain. Hell, some of us took almost 48 hours for our iPhones to activate (it was actually our previous provider's fault, because they took their sweet time letting go of the number). AT&T's even put out a press release yesterday saying they've solved all problems on their end and everything should be fine. Tell that to the business customers who had to wait until today to transfer their business account to a personal account to get their iPhones activated (business support only works M-F, apparently).
How are you doing?
AT&T: iPhone Activation Woes Improving [Washington Post]