University of California
University of California Museum of Paleontology: Distribution in Time and Space
The Understanding Evolution site provides evidence for evolution in biogeography utilizing relative dating, geography, and plate tectonics.
PBS
Pbs: Biogeography Polar Bears and Penguins
From the Evidence for Evolution Library at PBS, this is a short article about biogeography. The distribution of animals is one source of evidence for Darwin's descent with modification.