A startup, Meraki Networks Inc, with backing from Google and other companies is looking to blanket San Francisco, CA with free wifi. Instead of putting the wifi repeaters on street lights, they plan on putting them on the roofs of residential buildings.

http://ap.google.com/article/ALeqM5jqegmzbVxvbQiIWpZ0T55M9n2-VgD8TURSR82