Here are several articles about SIDS.
Changing Concepts of Sudden Infant Death Syndrome: Implications for Infant Sleeping Environment and Sleep Position (RE9946) -- The AAP doesn't know why or how it happens, but "back to sleep" seems to have made a difference.
A Simple Explanation for SIDS (Crib Deaths) -- Dr. Mercola is quite a radical in many ways, but he does make sense sometimes. Dr. Mercola is quite a radical in many ways, but he does make sense sometimes.
CribLife2000 on SIDS: Eliminating SIDS by preventing SIDS
CribLife2000 - Eliminating SIDS: A Simple Explanation for SIDS