the GIS Data Depot
ImageNet
Terraserver
GlobeXplorer

Sites listed here are key lists of geo-data sources sponsored and compiled by others.
The original sites referenced here were the topic of an article I wrote in 1997.
It appears that the FGDC is no longer maintaining (or making available) their lists of other geodata sites which the article referenced, and do not appear here.

FGDC Clearinghouse Referral Server for NSDI nodes

CAST, the Center For Advanced Spatial Technologies at the Univ. of Arkansas; compiled by Stephan Pollard

CGRER University of Iowa Center for Global & Regional Environmental Research; compiled by Mark MacLennan

U.S. Federal Data Sources

• GeoData.gov
• CAST list
• CGRER list

U.S. State Sources

• CAST list
• CGRER list
• the State Surveyor's Association site may contain links to other local data sources.

Other Nations

• EUROGI, the European Umbrella Organisation for Geographic Information
• CIESIN, The Consortium for International Earth Science Information Network
• CGRER list

Universities

Commercial Sources

• CGRER list

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