It's always exciting to see those outside the web industry using an API to improve their sites. NY Times First Look blog has a great example of what Dallas Public Library has done with the Best Sellers API.
Decibel pitches itself as a leader in the music metadata space by citing a deeper and more accurate dataset than its competitors. The slick video (embedded below) on its site is quite convincing. Decibel claims to collect music metadata from all sources all over the world, including record labels and users, check it for accuracy, and compile it into the database. It’s ambitions are set high with the goal of creating an industry standard in music metadata, and why not? Someone’s got to do it!