Having now read into the DUMBO project a bit more, what they are attempting to implement is pure brilliance. I've read a couple of their publications, but I recommend reading this one as an introduction to what the DUMBO project is hoping to acheive.
The gist of the project is to create efficient wireless mesh networks - and link them via satellite to enable fast re-building of communication infrastructure in the event of a disaster. DUMBO have extended this idea though, and are also working on applications to work on top of this mesh - simple low-bandwidth applications tailor-made for disaster situation requirements.
It looks like a great project, and one I'll be keeping my eyes and ears on in the future. Great work guys.