My thoughts on further social business opportunities: how about rationality consulting? If SI/LessWrong can establish enough credibility as rationalists this is worth money to both non-profit organizations and for-profit businesses, as well as potentially to consumers (as with Eliezer's rationality books). Rationality consulting would probably have to be done for free at first, of course. As a secondary benefit, this would also help with the ongoing effort to measure the impact rationality training has on an individual or an organization.
On a meta level, offering a prize may be a good way generate social business ideas, since the prize would more than pay for itself if the idea is profitable enough. Resource strategy consultants for non-profit organizations do exist, and business entrepreneurs (having expertise in resource strategies from another angle) might also like the idea of a prize.
This is also a topic that SI's Volunteering program can address, which I notice in the Strategic Plan that SI plans on growing.
Luke responded that "actually, a rationality teaching/consulting business is already in the works! That's the 'Rationality Org' we plan on spinning off from Singularity Institute."
I asked this question for the Q&A:
I also recently asked this of Luke for his feedback post before the Q&A was up, and he mentioned in his response that SI is continuing to grow the Summit brand in a multifarious manner. Luke also asked me for additional social business ideas, citing a lack of staff working on the issue.
Less Wrong's collective intelligence trumps my own, so I'm fielding it to you. I do have a few ideas, but I'll hold off on proposing solutions at first. I find that this is a fascinating and difficult thought experiment in addition to its usefulness both for SI and as practice in recognizing opportunities.
Edited to add: I posted my own ideas concerning SI and social business in the comments. What are yours? Also, addressing some valid points made in the comments, what are some other innovative ways to fund SI?