Google earth
http://www.google.com/earth/index.html

USGS/NOAA North American Packrat Midden Database (version 3)
http://esp.cr.usgs.gov/data/midden/

North American Pollen Database
http://www.ncdc.noaa.gov/paleo/napd.html

USGS Quaternary Fault and Fold Database of the United States
http://earthquake.usgs.gov/hazards/qfaults/

NOAA World Data Center for Paleoclimatology - Data Sets Listing
http://www.ncdc.noaa.gov/paleo/datalist.html

NWIS: Mapper
http://wdr.water.usgs.gov/nwisgmap/

North American Drought Atlas
http://www.ncdc.noaa.gov/paleo/pdsi08_ts.html

Treeflow
http://treeflow.info/index.html