Not directly AP related but here is a university course on global sustainability that can be taken online for FREE.
Yes really for free, read more about coursera.org here : http://blog.ted.com/2012/07/18/completely-free-online-classes-cours...)
There is also a course on the US food system and at least one on growing a small business which would be relevant to people lurking around here...
A coursera.org co-founder was interviewed on Bloomberg today. (http://www.bloomberg.com/video/coursera-partners-with-top-universit...)
I don't want any of this to get off topic of AP, just wanted to point out this is free and credible knowledge, some of which you can apply to an AP based business (you don't actually get a school credit for it, yet anyway)