Came across this interesting piece of info on the Seattle Tech Startup DL.
OLSR (Optimized Link State Routing) protocol is a really lightweight mesh protocol that can run on mobile handsets over WiFi. It's been known to run over a 2000 node mesh.
See http://www.olsr.org/?q=about
I found this really interesting because I've been thinking (background low priority thread) about a low-cost way for peer-to-peer communication.
Adding this to my "list of things to look at" this year.
