An Atlas of Cyberspaces - http://www.geog.ucl.ac.uk/casa/martin/atlas/atlas.html
A fascinating collection of maps representing usage of the Internet, World Wide Web and other cyberspaces.
An Atlas of The Universe - http://www.anzwers.org/free/universe/
Nine maps that reveal the cosmos in increasingly distant scale, from the nearest stars to the edge of the visible universe. Created by Richard Powell, a British astrophysicist. Includes links to other astronomical maps and atlases.
Atlas of the Biosphere - http://www.sage.wisc.edu/atlas/
Environmental maps focusing on human impacts, land use, ecosystems, and water resources - University of Wisconsin's Institute for Environmental Studies.
Canadian Geographic Atlas - http://www.canadiangeographic.ca/atlas/intro.aspx?lang=En
Explore Canada's geography by region or theme; interactive map includes industry and other info. Produced by the Royal Canadian Geographical Society.
Color Landform Atlas of the United States - http://fermi.jhuapl.edu/states/states.html
State and national topographic maps showing landforms and vegetation pattern. Includes county borders and historical maps from 1895.
National Atlas of the United States - http://www.nationalatlas.gov/
Comprehensive views of scientific, societal and historical information collected by the Federal Government. Published by the United States Geological Service.
United Nations Atlas of the Oceans - http://www.oceansatlas.com/index.jsp
The "Geography" portion of the atlas is still under development, but the site is a wealth of information about our oceans and related controversial issues.