The geodata.gov portal, also known as the Geospatial One-Stop, serves as a public gateway for improving access to geospatial information and data under the Geospatial One-Stop e-government initiative. The geodata.gov portal is designed to facilitate communication and sharing of geographic data and resources to enhance government efficiency and improve citizen services. Geospatial One-Stop is one of 24 e-government initiatives sponsored by the Federal Office of Management and Budget (OMB) to enhance government efficiency and to improve citizen services. This portal will make it easier, faster and less expensive for all levels of government and the public to access geospatial information.

http://geo.data.gov/geoportal/catalog/main/home.page