This is a must read article about the Khan Academy developed by Sal Khan and receiving grants from the Gates Foundation and Google. It is such a great revolutionary concept, but also an incredible resource of video tutorials on 2200 different instructional concepts from K - 12. Wow, check it out!!
http://www.huffingtonpost.com/2011/04/04/the-khan-academy-and-educ_n_844390.html
And here is a link to the Khan Academy site:
http://www.khanacademy.org/
