Our API directory now includes 46 research APIs. The newest is the Globus Online Transfer API. The most popular, in terms of mashups, is the Mendeley API. We list 3 Mendeley mashups. Below you'll find some more stats from the directory, including the entire list of research APIs.
The Center for Investigative Reporting (CIR), one of the oldest nonprofit investigative reporting organizations in the United States, has just announced the launch of the brand new VA Backlog API which allows anyone to access the VA backlog-related data available in the CIR database.
If you know how to develop mashups then you may be in line to win some very big prizes. To get a sense of just how much money and how many prizes, take a look at the ProgrammableWeb Contest Guide and you'll find that there have been more than 45 mashup contests thus far.