It's not quite the safe as Wi-Fi in your iPod, but Bay Area Free Wi-Fi Wireless Hotspots has a downloadable listings of San Francisco Bay locations: wiPod is a little database that you can download to an iPod to be able to scroll through and see free locations throughout that region. The site looks new: just a single post from July 12. Nonetheless, regional guides to free access should help windshield warriors and neighborhood officeless workers.