What is Cladistics? 
The methods and terminology of phylogenetic systematics explained by the magazine Fossil News.
http://www.fossilnews.com/1996/cladistics.htmlIntroduction to Cladistics
Cladistics is a particular method of hypothesizing relationships among organisms based on the idea that members of a group share a common evolutionary history.
http://www.ucmp.berkeley.edu/clad/clad1.html
Willi Hennig Society
Society of scientists studying cladistics.
http://www.cladistics.org
Understanding Cladistics
Short introduction from the American Museum of Natural History.
http://www.amnh.org/exhibitions/Fossil_Halls/cladistics.html
Phylogenetics Methodology
Introduction to various phylogenetic statistical methodologies.
http://research.amnh.org/~siddall/methods/
