When checking out the ethics behind the site, I was at first torn. I thought “teachers should be coming up with a lesson plan based on the needs of their children.” It seems to me that a one size fits all approach to teaching is just lazy. But then the economics student in me decided that this is actually a pretty brilliant idea. Teachers can find a lesson plan that they like and tweak it so that it fits their own class.
Another question that comes up is “why wouldn’t teachers just put up crap in order to make money.” Well, since this seems like a fairly free market system, if someone was putting up an inferior product, people would not buy from them and thus they would be excluded from the herd.
All in all I think that this is a great idea. I also do not see it very different from teachers who sell textbooks. Are they not selling their ideas? If a teacher is talented, why shouldn’t they make a little extra money by selling their good ideas. In the end, the bad ones would fail to be bought, and the good ones would benefit the students, which is the most important thing.