If you're interested, you can check out a recent Google Tech Talk presentation presented by the Connexions people.
I recently saw this presentation elsewhere, and was quite impressed. They have gotten to the point where they can take online texbook-quality material and produce a bound copy for a fraction of what textbooks cost today.
Their content coverage is a little uneven--lots of Electrical Engineering, Bioinformatics, and Music, little Computer Science. But there's quite a bit there, almost a critical mass in some areas. Good stuff!
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