Brown University, Quaternary Environments Research Group
Carbon Dioxide Information Analysis Center (CDIAC)
Etopo5 Elevational DEM
Google
Mauna Loa CO₂ Record 
MapQuest
Miami Herald - Dave Barry
Microsoft TerraServer
NASA's Global Change Master Directory
National Geophysical Data Center (NGDC)
North American Pollen Database (NAPD)
The Onion
Past Global Changes (PAGES)
PLANTS National Database
University of Oregon Geography Department
USGS National Geospatial Data Clearinghouse
The Weather Channel
Yahoo!
Zip Code Lookups