Have you ever really enjoyed a particular author, but then been unable to find anyone like them?
Literature Map is a fun way of providing the answer!
You can start by typing in the name of any author. The closer two names appear to each other on the map, the more likely it is that someone will enjoy reading both of them. Give it a try and let us know what you find!
Off the Shelf 
This is sensational, simply the best tool of it’s kind I’ve seen – and as an avid reader I’ve seen a lot of this sort of thing. Much better than the old ‘If you like … ‘ lists. The only issue I have with it is that I played with it all afternoon and now have pages of authors to follow up!