Slashdot Asks: What Are Some Apps and Online Services You Use To Discover, Track and Evaluate Movies, TV Shows, Music and Books?

Earlier this week, news blog Engadget had a post in which the author outlined some of the apps that could help people keep track of TV shows, books, and music habits. A reader, who submitted the story, said the list was quite underwhelming. Curious to hear how Slashdot readers tackle these things.