I've explored using spaced repetition in various web-based learning interfaces, which are described at http://cicatriz.github.com I'd love to talk more with anyone who's interested. Based on my experiences, I have reservations about when and how exactly spaced repetition should be used and don't believe there's a general solution using current techniques to quickly go from content to SRS cards. But with a number of dedicated individuals working on different domains, there's certainly potential for better learning. I've been working on writing up a series of articles about this. Again, contact me if you want to be notified when that is released.