University of California
Understanding Evolution: Introducing the Arthropods
This extensive look at the arthropod provides enough information for any budding naturalist, but will also be interesting to one casually interested in insects, spiders, and crustaceans. The pictures are outstanding, and the writing is...
University of Arizona
Wendy Moore/how Did Flightlessness Evolve?
Discusses the reasons flightlessness evolves in some insects depending on their location.
Other
Principia Cybernetica Project: Insect Societies
A description of the evolution of the caste differentiation in insect colonies.