I guess what this highlights is a big opportunity for developers willing to invest some time in growing markets. The recent apple film "Making a difference one app at a time" highlights this. Most of the apps look incredibly simple to make, but because they serve a purpose in the markets they target, they take off in a big way.

The video that apple posted can be seen here: http://www.youtube.com/watch?v=PGtP6ZQ6Lt8