802.11 based meshing/routing
At the FHP Wireless talk. I know this domain pretty well so I'm not going to plow over old ground. If you think it's interesting, in addition to FHP, check out:
Here's a slightly aged Kevin Werback article about the topic. Robert Berger's Ultradevices company referred there is dead, but he's at the conference so track him down. Also check out the meshing capabilities in IEEE 802.16a.
Now it's getting a little more interesting, since audience members who are working on the same problem are banging away with questions, attempting to extract some of the protocol secrets that might be in the FHP architecture. Getting more context from the audience than the talk...