P2P Wireless
wmf: This is called mesh networking; the Google will turn up plenty of information, disinformation, products, research, etc. Right now it's pretty immature IMO, with a price/performance that is 10x (or more) worse than point-to-multipoint wireless. Technically, mesh is very cool because there are plenty of interesting problems yet to be solved, but practically I think point-to-point or point-to-multipoint wireless is better for rural Internet access.