I've sometimes thought about going to some small village somewhere and teaching interested locals how to code and use computers. I would need small, cheap devices that I can just replace whenever they get lost/stolen. Also standardized enough that I don't have to spend a ton of time doing hardware support. If someone brought a >$20 fully-contained device to market then I could buy 20 of them and plan a 6 month trip abroad. Being not super-useful as general purpose machines is a bonus.

This idea's been kicking around in my head since the OLPC was announced, but nobody's delivered yet. Chromebooks are too expensive.