Urban Entomology - http://www.entomology.ucr.edu/ebeling/ Online book written by Walter Ebeling that discusses arthropod pests in the urban environment and in the home.
Project ALAS - Arthropods of La Selva - http://viceroy.eeb.uconn.edu/alas/alas.html Large scale inventory of arthropod diversity in the lowland tropical rainforest of La Selva, Ecuador.
Sonoran Arthropod Studies Institute - http://www.sasionline.org/ Researches insects, arachnids and other arthropods that affect the Sonoran ecosystem. Located in Tucson, Arizona.