Anyone used this system? I found it through Khan Academy. The idea of open source education is fascinating (and welcome, considering the cost of curriculum!), but I'm wondering how it works in the "real world" of homeschooling.
Here's an article about ck-12:
http://mindshift.kqed.org/2011/01/the-living-book-movement-free-education-for-all/
I think we might try their Algebra flexbook for dd this year, but I'd like to see some reviews and get the opinions of some folks who've tried it.
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The website is ck12.org.
