ScienceDirectory.info is a leading science website including agriculture, metrology, industrial engineering, earth sciences, geography, mathematic, aquaculture, aerospace and more.
Busy Bee Geography
Resource for links to maps, the environment, people and places, and further reading.
http://www.busy-bee-geography.com/
Places OnLine
Association of American Geographers site providing annotated links to some of the world's best place-based web sites.
http://www.placesonline.org/