Some Authorities to test

Is it beginning? Are these authoritative and ready to use in the classroom?
I heard Salman Khan interviewed on NPR. I think Scott Simon is legit and he chooses legitimate people to interview. Khan seems legit.
This online school was reviewed in this article in the New York Times. It's an enrichment program rather than a complete school.
Pearson Publishing offers an online version of some textbooks. We are using several of their Spanish texts at EA: