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I like the Livescribe pens and find them useful. But as computers, they are a dead end. They're just not flexible enough to be general-purpose devices, like tablets. An iPad that worked well with pen input would make me drop the Echo. Apple's competitors already have rudimentary pen-based tablets out, and who knows, maybe the iPad 3 will have some surprises for us.

In a growing number of schools, educators are echoing Papert's assertion that engaging students by starting with the concrete and solving hands-on, real-world problems is a great motivator.