Although it's not super-public knowledge yet, Sparkfun is working on something very much like what you're talking about. It will be a free, CC-licensed, downloadable binder, with tutorials, worksheets, and activities geared toward beginners, middle and high-school aged kids. We're pretty close (a few weeks would be my guess) to releasing it, and would welcome any feedback from this list. If you want to be notified when it's available, signup for the newsletter at: <a href="http://learn.sparkfun.com">learn.sparkfun.com</a>
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