About the Primates
http://www.primate.wisc.edu/pin/aboutp.html
Authoritative information from the Wisconsin Regional Primate Research Center (WRPRC) about prosimians, monkeys, and apes.
Introduction to Primates
http://www.mc.maricopa.edu/academic/cult_sci/anthro/exploratorium/primates/index.html
A well illustrated introduction to primate anatomy and evolution, with links to numerous subtopics.
Journey into Phylogenetic Systematics
http://www.ucmp.berkeley.edu/clad/clad4.html
This site introduces you to the "philosophy, methodology, and implications of cladistic analysis."
Primate Taxonomy
http://www.primate.wisc.edu/pin/taxon.html
Part of the WRPRC Primate Info Net, this site links to lots of material on primate classification.
WRPRC Audiovisual Archive
http://www.primate.wisc.edu/pin/av.html
Numerous links to photographs, videos, and vocalizations of primates.