Fresh Press compiles mentions of books and authors in the national media daily.
Lexile's Find a Book
Overbooked is for serious readers and is a source for lists of books with starred reviews and for hot titles in all popular genres.
What Should I Read Next? Simply plug in a book you like, and this site will kick back a list of recommendations.
What's Next? This is the perfect one-stop, no-frills source for series information.
Whichbook.net uses mood and appeal factors, not plot descriptions, titles, authors, or subject schemes.