(Can be used to create historic maps and reports using US Census data)

TIGER mapping service. Also check the TIGER homepage on Census (TIGER FAQs, more)

(interactive map browser, more)

(thematic map generator; down?)

(GIS resource lists, inc. job information, data sources, online courses, and more)

Geography page at EINet Galaxy

Geography and Remote Sensing WWW Virtual Libraries

(creators of ARC/INFO, ARC/VIEW, etc.)

(Excellent source of free data on transportation, including GIS products)

"Just Another Medical Geography page"
(Devoted to the spatial aspects of health research; offline, archived from 2003)

(Detailed satellite telemetry of Earth, much of it free for downloading)(also check the Google Maps "Satellite" option)