Use this Ruby SDK to integrate U.S. Department of Labor datasets into your apps. After installing the required JSON Ruby Gem and retrieving the Git repository, use this SDK to access information like: workplace injury and illness rates, mine accident info, employment and wages reports, consumer price indexes, Veteran employment data, BLS numbers, and much more. The API documentation contains detailed instructions on getting started, including extensive code samples.
On December 8, 2009, the "Open Government Directive" was issued by the White House that requires government agencies to takes steps in establishing openness and transparency. The directive includes the publication of information and data sets.
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.