Goodreads is a Social Web site about books. They need a recommender system. Thus, they issued a challenge: design their recommendation engine, and they will read your resume. I suppose this is the poor man’s version of the Netflix challenge.
There is nothing wrong with the challenge, but I wish the current Goodreads engineers would publish their own recommender system. How hard can it be to do item-based analysis?
Update: Students at Stanford built and tested a recommender system for Goodreads.