According to David, AT&T is giving WiFi users 2 free hours of access per day. But AT&T didn't stop there -- they designed an iPhone-specific portal to sign onto the service. A local Starbucks manager told David that all 7,000+ Starbucks stores in the US should be "finished by summer."
I should note that this iPhone portal isn't specific to Starbucks -- every AT&T WiFi hotspot features the same interface -- and all devices are eligible for the 2 free hours of access (not just iPhones and iPod touches). Any WiFi device should be able to logon to the service. It is nice to see AT&T finally giving connectivity away for free.