National Data Catalog – Open Platform for Government Data Sets and APIs
http://nationaldatacatalog.com/

The National Data Catalog is an open platform for government data sets and APIs. It makes it easy to find datasets by and about government, across all levels (federal, state, and local) and across all branches (executive, legislative, and judicial). The data here is imported from multiple sources and curated by our staff. Their catalog contains 1971 data sets and was last updated about 5 hours ago. They aggregate sources from: data.gov, data.dc.gov, utah.gov, datasf.org, and the Sunlight Foundation and its partners. This has been added to Research Resources Subject Tracer™ Information Blog. This has been added to New Economy Analytics, Resources and Alerts Subject Tracer™ Information Blog.