Reco - Book recommendations from people you trust
Goodreads - See what your friends are reading.
Monster.com - Monster.com is one of the largest employment websites and job search engine in the world.
LibraryThing - A home for your books.
Rove.me - Travel guide that suggests you the best time to visit a destination based on experiences it offers.
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes