Also based on your favourite author, What Should I Read Next analyses Amazon’s huge database of real readers’ favourite books to provide book recommendations and suggestions. Quite accurate!
Goodreads is a huge social network for readers and offers great book lists. If you log in and enter your own reading habits, book shelves, etc. you get excellent customized recommendations.
LibraryThing, another readers social network, has an impressive Zeitgeist page, with lists of favourite authors, books etc. Click on an author to find a useful “If you like” link. Or click on a book for tags and similar books.
I am looking forward to BookFlavour to be up and running: you will enter your criteria (sad, scary, funny, etc. ) and it will devise a list with them. Based on a similar concept but designed for adults so will only suit senior students, Whichbook stretches your reading habits…
And if all fails, ask your librarian 😉