Audubon Expedition Institute - http://getonthebus.org
Fully accredited college program affiliated with the National Audubon Society. Its focus is on ecology and environmental issues. Offers a program overview, academics, campus life, admissions, stories, news, alumni information, and jobs.

Backyard Nature - http://www.backyardnature.net/
Nature study basics, with an emphasis on backyard plants and animals. Includes a section on naming and classification, list making, and "why bother with nature?"

Building Models in Ecology and Natural Resource Management - http://campusterrassa.upc.es/catedraunesco/cursos/angles.htm
Online course offered by the Politechnic University of Catalonia.

Quantitative Population Ecology - http://www.ento.vt.edu/~sharov/PopEcol/popecol.html
Thirteen online lectures with lab practicals.

Rainforest and Reef - http://www.rainforestandreef.org/
Field Courses in Rainforest and Marine Ecology, held in South America, Central America, Canada and Australia

Rock Creek Environmental Studies Center - http://spot.pcc.edu/rcesc/
on the PCC Campus,Oregon, contains 100 acres of diverse habitats and is used by the public, schools and the colleges environmental, biology and landscape architecture programs

Tropical Field Stations in Belize - http://www.marineecology.com
Learn about Belize's coral reef, mangroves, geology, ornithology, mammology, entomology, botany, river ecology, barrier beaches. Field study options for individuals or groups.

Understanding Ecosystem Management - http://www.blm.gov/education/ecosystem/ecosystem.html
U.S. Bureau of Land Management information about basic concepts of ecosystems; includes some classroom materials.