Wikimedia
Wikipedia: Punctuated Equilibrium
This brief explanation of punctuated equilibrium includes paragraphs on the history of the theory and the controversy surrounding it.
CK-12 Foundation
Ck 12: Biology: Macroevolution
[Free Registration/Login may be required to access all resource tools.] Constrasts gradualism and punctuated equilibrium.
PBS
Pbs Learning Media: Early Tetrapod Fossils
In this transcript of an interview filmed for the PBS series "Evolution," scientists Ted Daeschler and Neil Shubin describe the discovery and significance of some of their key fossil finds.