LydiaLearn
As we've built this project up, a nagging question has always been, "How will developers get paid?" Open source has developed some surprisingly generous donations of time, money, sweat, perhaps blood, and certainly tears. And some remarkable business models have suceeded (witness Opera now giving away its project while its stock climbs).
Somewhat described as the "Ebay of Learning Objects", LydiaLearn forms a marketplace for developers and content aggregrators to meet. It may take a while; a lot of professors may be disappointed when their power-point slides don't find a ready market. I do think we'll see some cool results come from this.