Public Health Entomology http://pherec.org
Public Health Entomology Research and Education Center conducts research on mosquito control. The site has downloadable "Entguides" on a number of insect species.
Kendall Bioresearch Services http://www.kendall-bioresearch.co.uk/
Guide to the classification and identification of insects and other arthropods, with biological notes and examples for all major groups. Information on control of rural and domestic insect pests.