Several suggested bookseer.com, but it wasn't working when I tried it.

Other suggestions included:

http://nancykeane.com/booktalks/title.htm#R

abookandahug.com
librarything.com
Novelist database
http://www.erl.vic.gov/au/readers/who.htm (This was mainly authors of adult
novels.)
http://atn-reading-lists.wikispaces.com/Read+Alikes
www.yournextread.com
http://www2.kdl.org/libcat/WhatsNextNEW. asp (This is to search for the next
book in a series.)

www.ala.org/teenstopten