ALA WINNERS:
http://www.ala.org/mgrps/divs/alsc/awardsgrants/bookmedia/index.cfm
Young adults:
http://www.ala.org.ala/mgrps/divs/yalsa/booklistsawards/quickpicks/qphome.cfm
Murder Mystery
http://www.stopyourkillingme.com/
Fantasy:
http://bestfantasybooks.com
Good Reads
http://goodreads.com
A site at which you can comment on books, and see what others are reading. There are specfic groups on the site.
WhatShouldIReadNext.com
reader2.com
Search for book recommendations
AllReaders.com
"Search for a book to see recommendations.