OLPC XO-3: The One Laptop Per Child project's concept for its next-generation XO device -- a superslim plastic slate tablet -- makes even the MacBook Air look chubby. Bonus: There's a loop at the top corner to hang it off of a backpack.
Image gallery: Concept designs point the way to your next laptop
Tomorrow's models may roll up, sport multiple screens or be repositionable, Transformer-style
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