Library Hunter will catalog your movies, books, games and music albums... all in one place. You don't need to enter the information by yourself, Library Hunter will download it from the 'Net, enter only the title or keyword to search with. You've got more than one Mac, or a Mac and an iOS device? That's perfect: Library Hunter can sync everything via Dropbox.
Version 2.0 Beta 4: Release notes were unavailable when this listing was updated.