American Institute of Biological Sciences
Action Bioscience: Issues in (Biology) Education
A series of articles on current issues in teaching biology. Several are available in Spanish.
Howard Hughes Medical Institute
Hhmi: Ask a Scientist
Ask questions about any topic in biology and receive an e-mail response within two weeks. There is an archive of "Top 10 Questions" and responses for each of the following topics: animals, human biology, general biology, evolution,...