Descriptions of US Federal datasets

Data.gov claims to increase the ability of the public to find, download, and use datasets that are generated and held by the US Federal Government.
It provides descriptions of the datasets (metadata), information about how to access these datasets, and tools that leverage government datasets.
Further data catalogs will be added. Federal, Executive Branch data are included in the first version.
More: The access point:
www.data.gov
A commentary:
scienceforseo.com/../shiny-new-dataset