On10.net there's a cool school that uses Tablet PCs and requires all the fifth graders to have one. Obviously a private school (and expensive) but cool nontheless.
Alfred Thompson, who works with schools as part of his job at Microsoft, blogs more about it.
John Phillips, director of education at the school, has a blog and talks about the project too.
By the way, we're looking for other educators who are using technology in interesting ways in their schools. Do you know someone?

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