Panera Bread Company - available in over 1250 locations from California to New Hampshire and lots of places in between. Check the Panera Bread web site for your State's locations and look for the Wi-Fi stickers in the window. Access may be limited to 30 minutes at peak time of 11:30AM-1:30PM.
And thats just Panera's look at all the others they deal with
Giant operates 179 supermarkets and three free-standing drug stores in Virginia, Maryland, Delaware, New Jersey, Pennsylvania, and the District of Columbia. http://www.ftc.gov/opa/1998/10/ahold.shtm
ICOA (OTC BB: ICOA), announced that the company has re-launched the Denny's Wireless Internet service as an amenity based network, continuing to bring free wireless Internet access (Wi-Fi) to Denny's restaurants across the USA and Canada. http://www.wi-fitechnology.com/displayarticle2598.html