The trouble with some music sites and APIs on the web is that they have been known to get taken down due to legal battles. Worse yet, often the only real way to monetize is to take a teensy percentage of an already low-priced track. BandsInTown wants to help your music site stay up and even make money.
Kasabi has just moved into public beta. The private beta is over, and Kasabi is openly ready and willing to become your data marketplace. This is similar to what the primates over at InfoChimps are doing: building a community around data sets and APIs. The Kasabi API collection feels like a first attempt at standardizing the task of designing an API for accessing a dataset.