TasteDive - TasteDive recommends similar music (musicians, bands), movies, TV shows, books, authors and games, based on what you like.
Gnoosic - Even if you don't know what you are looking for - gnod will find it.
LivePlasma - Discovery engine map for books, music, and movies
Musicroamer - A visual Pandora for discovering new music
Flixster - Share movie reviews and ratings with friends.
Music Walker - Explore and play (via YouTube) songs similar to a seed song.