USDA Animal and Plant Health Inspection Service I got two great homepages out of the May/June -Organic Gardening on Biological Control Natural Enemies of Vegetable Insect Pests
I also found a good link in the California Cherimoya Association Newsletter toUC Pest Management GuidelinesOver 15yr. of IPM knowledge from University of California at Davis,major pests with color photos,biologies,monitoring methods,and Some ORGANICALLY ACCEPTABLE METHODS and treatment strategies remember organic growers don't need any stinking herbicides or pesticides.
National Biological Control
Institute
USDA Animal and Plant Health Inspection Service
Sustainable Practices for Vegetable Production in the South By Dr. Mary M. Peet - North Carolina State University more IPM than organic but lots of useful information.
Newsletter International Organization for Biological Control
Home Page of the Association of Natural Bio-control Producers
I get my live biological pest control from 
Rincon-Vitova Insectaries.
For bio-control information
and for pictures of pests and their natural enemies I go to
Entomology
ColoState EDU.
The guide Cornell University biological control
If you want to see some great pictures of beneficial insects go to the Florida
Agricultural Information Retrieval System (F.A.I.R.S.) Take a look at their
list of www handbooks . Their beneficial insects hand book is great.
Beneficial
Insects or check out the factsheets and insect pictures from the set produced
by the Clemson University Cooperative Extension Service - United States Department
of Agriculture joint project
For bio-control of tropical pests try:
Cooperative Research Centre for Tropical Pest Management
Midwestern Wetland FloraField Office Guide to Plant Species:Species List and Identification Key
Mulch and Mulch-Related Information tryMULCH-BASED AGRICULTURE GROUP
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