The OLPC project took a shot at this but besides creating net-books it wasn't too successful, to summarize, the OLPC project was ambitious but rubbish ;-) I don't know yet how to solve the problem of educating people ion those countries, especially when it comes to basic things like literacy and/or math but I definitely think it would be worth quite a lot of effort and also be a business opportunity because of scale (if not now maybe also in the long-run).