University of California
Ucmp: Evolution: Theory and Science
An introduction to Darwin's theory of evolution with hyperlinks to other topics on evolution, including a timeline of evolutionary thought.
CK-12 Foundation
Ck 12: Life Science: 4.1 Theory of Evolution
Discover how Charles Darwin developed the theory of evolution through his observations in the Galapagos Islands.
American Geosciences Institute
American Geological Institute: Evolution and the Fossil Record
The American Geological Institute has done an excellent job of defining and explaining evolution in this online booklet. Darwin, fossils, natural selection, and change over time are some of the concepts that are covered. Make sure to see...
Other
About darwin.com
This comprehensive site gives you all you need to know about Darwin and more. A timeline, pictures, books Darwin wrote, and links are just a few of the topics you will find on this site.
Other
Bio Web Evolution: Homepage
This site from BioWeb Evolution was originally created as a ThinkQuest entry, and it has some good basic information about evolution. This page is on fossils and geologic time.