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.
IBM announced v2 of its Watson IoT APIs last August. The company has now announced the pending removal of v1. IBM has yet to set an exact date, but plans to announce such information soon. v2 includes all v1 features plus new additions and enhanced ability to integrate with third party apps.