WirelessMesh
What is a Wireless Mesh
What is a free information network
What do we need to setup a wireless mesh
Wllingness to share a pinch of what you have, apart from the following.
Hardware
Linksys WRT54GS V.4 Wireless Routers. This is used since we can add freifunk firmware. Freifunk site also lists few other routers. You can use any of them. Of course it is possible to create a wireless mesh using any PC with a WLAN card.