As predicted in February, US iPhone subscribers are now getting free Wi-Fi Access at AT&T hotspots around the country including Barnes and Noble and Starbucks.  This correlates to the plans offered in the UK by O2 and Tmobile in Germany. 

Apparantly it isn't terribly hard to spoof the iPhone interface and get your laptop on free WiFi either - as a Macrumors forum poster shows us.  No announcement from AT&T or Apple has been made but expect one shortly.