Geography 

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Check this page often, since it will be updated as I find new resources.

MIT OpenCourseWare for Urban Studies and Planning
Free lecture notes, exams, and other resources from MIT courses. Use the search box to find courses that might not be obvious at first (e.g., search "geographic" to find courses using GIS, some in Civil Engineering)

Fundamentals of physical geography (2nd ed), by Michael Pidwirny

The American Geographical Society

The National Geographic Society

Association of American Geographers

Royal Geographic Society

USGS Geography
Mostly focuses on US, but there are links to global images and data.

Center for Spatially Integrated Social Sciences
"Programs focus on methods, tools, techniques, software, data access, and other services needed to promote and facilitate a  integrating approach to the social sciences."

The Geography Network
Managed and maintained by ESRI.

PhysicalGeography.Net
Educational focus.