IFTS Atlas The purpose of this atlas is to provide students and researchers of birth defects in academia, industry and government with a set of images of both rare and common observations in fetuses and neonates from common laboratory mammals.
http://www.ifts-atlas.org/
Zygote A colorful and informative site devoted to the molecular genetics and cellular biology of development and embryology (from Swarthmore College).
http://zygote.swarthmore.edu/