Meet my friend Max
Although it does smack of late-90s bubble, the emerging WiMax standard looks interesting. Unlike WiFi, it looks like there might be a way for providers to actually make money at this. There are plenty of places that are underserved by broadband and this could be a way to achive broader distribution. If the technology is reliable and the cost low enough, it could really take off or at least provide some competition for existing broadband access technologies.