I do not know of any specific examples of more than than two boards communicating.
The simple examples on my site are for two boards.
If the cost of the XBee radios (~$20) is not an issue take a look at the MaxStream
XBee datasheet and mesh networking application notes. You could google for
"zigbee mesh mote" which should get you some more information.
Doing a wireless network of ten boards is an ambitious project to start with.
(* jcl *)