We definitely need a well designed website or search engine for learning materials. I've wanted an algorithmic way to figure out the most useful websites to lea

We definitely need a well designed website or search engine for learning materials. I've wanted an algorithmic way to figure out the most useful websites to learn a topic. Perhaps if you had data on which websites users bookmarked, you could cluster websites by topic and also figure out which sites are bookmarked by beginners and which sites are bookmarked by experts. Of course a simple crowd-sourced upvoting system might work just as well.