Well, Fonera is the self proclaimed World's Largest WiFi Community. Each member will share their own wireless access point with other members. It doesn't mean that anyone who walks by gets free WiFi access but rather that any member who also share their access point at home will get free wireless Internet access when they walk by yours. Those who don't share pay for the access while those who are not members simply do not have access.

You can check the Fonera map for an access point near you!