Wibiki joins Fon in reiterating failed business models of the past: They suggest installing their client software on your computer and server software on a Linksys router that can be flashed with their firmware. Their approach is similar to Fon's--and the one that Sputnik, Joltage, and SOHOWireless tried years ago and left--in which there's a pool of users in an authentication database and each access point has its own separate backhaul paid for by the person running the server software.
The Wibiki folks (part of Speedus) suggest that by creating an environment, a business model will follow. They ask on their blog, "How can we create sustainable business models to make Wi-Fi ubiquitous and free for users?" [link via Yeah!Fi]