University of Wisconsin
University of Wisconsin: Amphibian Embryology
This tutorial goes into great detail describing the embryological development of amphibians. Written explanations, photos and quicktime movies are all included.
Khan Academy
Khan Academy: Human Embryogenesis
Explains what happens during embryogenesis, the first eight weeks of pregnancy.
University of Wisconsin
University of Wisconsin: Amphibian Embryology Tutorial
This amphibian embryology tutorial takes an in depth look at the question "Why study amphibians?". Through this tutorial students will develop a better understanding of vertebrate development.