There's research on OLPC, you know. I recall reading a... randomized Peruvian study? which found less than impressive results on scores in villages receiving laptops.
School is a huge, huge confounding factor in any study of education. Kids exhibit extreme reactance against anything pushed in school. The educational theories that OLPC is based on assume that kids will enjoy exploring and learning, but in a school setting, this is unlikely. A study like this (which is, of course, exploratory and thus mostly only as a guide to what to study next) is a better design, although of course it's harder to perform.
Full disclosure: I have friends who have worked on OLPC, but we pretty much haven't talked about the project.
Just read this article, which describes a splashy, interesting narrative which jives nicely with my worldview. Which makes me suspicious.
http://dvice.com/archives/2012/10/ethiopian-kids.php
So this sounds really inspiring and stuff, even subtracting some obviously sensational stuff (I assume "hacked Android" means "opened up the preferences dialog and flicked a switch"). I've poked around a bit and found similarly fluffy pop-philanthropy articles. Anyone know if there's more reliable information about this out there?