While searching other sites and blogs to come up with a way for students to be self-sufficient when it came to choosing the next book they would read, I came across the free no sign-up required YourNextRead.com. It is simple to use with the search feature on the home page. All students have to do is enter the title of a book, author or genre they like and up pops suggestions for them!
I chose this site over the others I was researching because it displays book covers and doesn't overwhelm the student with millions of choices (and again, no sign-up). It simply displays a graphic web of 8 other titles. You are not guaranteed to get back 8 results, but user recommendations can be suggested. The user can even agree or disagree that the the suggested books would be a good match.
The site has additional features, but really all I want is bare bones book recommendations.