Our API directory now includes 195 science APIs. The newest is the AnnotQTL API. The most popular, in terms of mashups, is the NCBI Entrez API. We list 4 NCBI Entrez mashups. Below you'll find some more stats from the directory, including the entire list of science APIs.
A few years ago, Tim Berners-Lee (inventor of the World Wide Web), urged his TED Talk audience to share raw, unstructured data in order to boost innovation and solve critical problems. The INOH API project aims to bring Berners-Lee's vision to light.