The website for Insects Limited which specializes in non-toxic pest control methods.  There is a section of the site that offers images and information to identify common cultural heritage pests  and offers tips on monitoring collections.  They web-publish the Fumigants & Pheromones Newsletter.
http://www.insectslimited.com/
http://www.insectslimited.com/Newsletter

This website is provided by an alliance of four pest control organizations (Fumigation Services and Supply, Insects Limited, Food Safety Specialists, and the Food Protection Alliance to provide updates on fumigants and their registration status. Also a source for material safety data sheets for lots of pesticides.
http://www.fumigationzone.com/

Bell Environmental, a national pest control company website.
http://www.bell-environmental.com/

Do-It Yourself Pest Control Inc., a resource for supplies for residential and commercial control of pests.
http://www.doyourownpestcontrol.com/
http://www.epestsupply.com/pest_information.htm

Degesh America Inc. is a company that produces the aluminum phosphide product Phostoxin®.
http://www.degeschamerica.com