And the winner is:
Akilele Mbwati and her all girls team from the Democratic Republic of the Congo producing a wonderful web application which will make a real difference to the people in the neighbourhood: Google H2O QC™, an application that alerts all downstream residents of the Luvua river of drifting crocodile dung through postings on Google+ with GPS-tagged videos submitted by other users. This enables all participants to avoid contaminated water by only fetching some when there's no Turd-Alert™.
The minor inconvenience of having to hike 420 miles to Kabinda to up- or download the current water status will surely soon be a thing of the past when everyone will have an affordable smartphone [~$22?] and a Google-Loon™ hovering over the village.