Innovation in web service APIs is not always technical, sometimes it's about money. Such is the case with Yahoo's announcement that later this year they will begin charging for usage of BOSS (Build your Own Search Service), their search web service for developers. Given that search revenue is typically ad-driven, and that advertising doesn't typically mesh with APIs, this has meant that search APIs have been one of the most challenging classes of APIs for providers to monetize. So it's notable to see how Yahoo has chosen to tackle this: via a 'utility' pricing model, somewhat akin to how infrastructure services like Amazon Web Services charge by usage.
National Mouse Metabolic Phenotyping Centers (MMPC) are a group of National Institutes of Health sponsored resources that research diabetes, obesity and other metabolic diseases based in mice. The MMPC has made much of its research and data available through the MMPC API. Developers can pull from the data sets to enhance the research with big data tools and analytics.