It's pretty cool. The CK-12 people have apparently released everything Creative Commons-licensed, and if you click on any of their titles and go to the little icons on the navbar to the left, it looks like you can download PDFs of even the works-in-progress textbooks.
I hope more educators and homeschoolers start using this site, instead of relying on expensive and possibly inaccurate standard printed texts, like that Texas Board of Education thing that's going on in the Lounge.
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