www.khanacademy.com
Great instructional videos and free. If you have a kid that is having trouble with math concepts...this is the place...
The problem with these "academies" is that they may be great as supplemental or "hobby" teaching material, but they are not accredited (at least, not yet) and are not likely to be unless providing more than just one specific course. Also, it "flips" the model, but doesn't really displace or uproots the system, financially. However, it's a great resource for those who just want to learn or learn more and better.
From Turning the Classroom Upside Down | Why not have lectures at home and 'homework' at school -- and let students learn at their own pace? - WSJ, by Salman Khan, 2011 April 09
But it doesn't have to be this way. In 2008, I started a non-profit organization called the Khan Academy to deliver free online education. As it turns out, our tools have given students and teachers the power to "flip" the traditional classroom: Students can hear lectures at home and spend their time at school doing "homework" -- that is, working on problems. It allows them to advance at their own pace, gaining real mastery, and it lets teachers spend more time giving one-to-one instruction. ..... < snip > < snip > ..... The problem with this model of instruction is that it leaves behind large gaps in understanding. For A students, it might be a 5% gap, for C students a 30% gap. But all of them end up with a Swiss-cheese education -- full of holes. Little wonder that, when they reach algebra and calculus, they often struggle. It's like being trained to juggle oranges half-competently and then being expected to juggle knives.