A peer-to-peer broadband solution to replace ISP dependence. Perhaps this could be used on a small scale at first for hacker communities and then grow from there. Challenges would be on interconnecting between p2p community centers without relying on major ISPs. A hyrid approach might be needed at first to establish connectivity.

Previous efforts:

Netsukuku - http://www.masternewmedia.org/the-alternative-p2p-wireless-i...

P2P Foundation Blog - http://blog.p2pfoundation.net/