This can be done using Freifunk's Freimap, Opennet's or using ISF's or rolling our own...
I have contacted the techno-viking to see if he could share his IkiWiki/OpenLayers integration to document the nodes locations and so on... Awaiting his feedback. -- anarcat 2011-10-10
Got the code, improved it, this works now!
We are not using plugins/contrib/googlemaps! 
See plugins/contrib/osm!
done!