I played with Library Thing and liked it much more than I did when I tried it last time.  The discovery exercises forced me to look around and try different things.  I think this would be a good way to add books to pathfinders for my students.  Using their recommendations with my knowledge, it would be easy to create the kind that say:
If you liked A Child Called It, try...
Here are some random books from my library.
 
 
