Here's the list of bay area cities included in the wi-fi hotspot listing so far:
Aptos, Berkeley, Boulder Creek, Burlingame, Campbell, Capitola, Carmel Valley, Carmel-by-the-Sea, Cupertino, Emeryville, Felton, Foster City, Fremont, Half Moon Bay, Hayward, Los Gatos, Menlo Park, Mill Valley, Milpitas, Monterey, Mountain View, Napa, Oakland, Pacific Grove, Pacifica, Palo Alto, Portola Valley, Redwood City, Richmond, San Carlos, San Francisco, San Jose, Santa Clara, Santa Cruz, Scotts Valley, Soquel, Sunnyvale, Woodside
Bay Area Free Wi-Fi Wireless Hotspots