I had the honor to work on a very nice project this year for the eGenix GmbH. It is about bringing a better VAT infrastructure to the African country Ghana. We used technologies like Python, Django, Javascript and YUI.
To get an idea of it I recommend to watch this lightning talk Marc-Andre Lemburg gave at the EuroPython 2009.
Update 2009-09-02
African press is speaking about the start of the pilot phase:
Published on September 2, 2009