In any case, you can look up an AT&T hotspot near you or search for a Starbucks. Let us know if you've been able to take AT&T up on their offer.
[via iPhone Alley]
Update: It looks like AT&T has once again mistakenly posted this information. That's right, at the moment AT&T is not offering free wifi to iPhone users, but it is in the works. Look for an announcement, and a quick retraction, sometime next week (and then the week after that, and once again...).