ayb11 writes "According to this article, the Panera Bread chain of Bakery/Cafes (think Starbucks that bakes their own bread) is the largest provider of free WiFi in the US. Their web site says, " There are currently 573 Wi-Fi enabled Panera Bread bakery-cafes, from California to Virginia. More are added every day." (Even my retired dad takes his barely-used laptop over there so he can get free refills on coffee.) Their full list of hotspots is here."