Website: http://libremap.org/
The purpose of the Libre Map Project is to aggregate and make digital maps and related GIS data available for Free.
Data – search and download Maps and other GIS data
Documentation – information on Cartography and GIS related topics brought to you by Wikipedia.
Email us – maps AT libremap DOT org
Available Data
24k scale USGS DRG’s – detailed topographic maps for all 50 states.
SVG boundary border files for all US states (including state, county, and town boundaries)
TIGER/Line – All 2003 data is available.
GeoNames – All USGS place names are available for searching. The data can be used to find appropriate DRG’s.