This is all a fantastic idea. Distributing Wikipedia in a fashion similar to git will make it a lot easier to use in areas where Internet connections are not so common.
I wonder could this sort of feature be implemented in the existing Kiwix codebase? That would be ideal I think.
Ward is working on it. :) http://wardcunningham.github.com/ https://github.com/WardCunningham/Smallest-Federated-Wiki