MS have now published an eBook discussing the merits of one device/person. They're now calling it 1:1, rather than one laptop per child or any of the other phrases that have been used.
Looking at some of the 'myths' of students having their own devices in the classroom. (N.B blog post by someone who is pro students having their own devices)
US website with lots of tools for learning / a blog etc., This particular one is an ebook containing webtools that you might not have come across before.