Georgia State University
Georgia State University: Hyper Physics: Particles
This is a very detailed site containing information on several sub-atomic particles including the Hadron.
Other
National Academy of Sciences: Biography of Rodney Cool [Pdf]
Rodney Lee Cool spent much of life's work on hyperons. This is the classic biography of a real-life scientist, a particle physicist. It's touching and enlightening, complete and full of science and significance. Requires Adobe Reader. [PDF]
Illinois Institute of Technology
Illinois Inst Tech/hyperons
Short and sweet definition and explanation of hyperons in the particle zoo. Nice info about time dilation making hyperon beams useful.