The site you haven't visited yet (but probably should have)
Check out AfriGadget : http://www.afrigadget.com/
They bill themselves as "solving everyday problems with African ingenuity". If necessity is the mother of invention, it's original home is Africa. For the rest of us in the world who are far from Africa, they may be encountering problems we've never considered, and are solving them with limited tools and materials in very unique ways.
For example, go check out Richard's "Lion Lights". There's a problem you won't encounter in Wisconsin (in my case), but the creativity is undeniable. I've bookmarked it.