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Federal Geographic Data Committee
http://www.fgdc.gov/
Official site.
FGDC Tools (USGS)
http://geology.usgs.gov/tools/metadata/
Freely available FGDC metadata editors and related tools that operate on a wide variety platforms.
Geospatial Data Clearinghouse
http://clearinghouse1.fgdc.gov/
Search across 80 different spatial data servers.