I think this is a very good use of existing technology; and the additional fact that African farmers can now use their cell phones to find out where they could sell their crops is another useful application.
One point that struck me in the article was this:
As Foreign Policy remarks, "We've reached a very strange point in human history when it is assumed that people who don't have access to food will have working cell phones."I wonder if we can classify this as great "market proliferation"? With the want of having a cell phone now becoming a need of having one?
You can read the rest of the article here.