Not sure yet... I think the largest functionality will be selling rationality-related books and the like, pre-vetted by rationalists, with reviews, and all in one place. I'm not sure if we can get bulk pricing, and there's not much incentive to buy books from the LW store if you can get the same from Amazon. What I wanted to do was set up a checkout system where you can choose your price beyond a certain minimum, where proceeds will go to your choice of one of a few rationality-related charities listed (potential candidates being FHI, SIAI, Richard Dawkins Foundation, et cetera). At some point I'm going to dig through my old files and find my original proposal, then modify it and post it in the discussion section here at LW. I'll ask for proposals and request ideas/critiques. That'll probably be in a week to three from now.