Here is a brief list of links to sites of related interest.

Weed Management at Penn State   A great site for a wide range of weed management info, including an extensive listing of invasive species links

Arborchem Products, Inc.
BASF
Bayer CropScience
Dow AgroSciences Ltd.
DuPont
Ernst Conservation Seeds
Monsanto
PBI/Gordon Corporation
Pennington Seeds, Inc.
Syngenta Professional Products
Townsend Chemical Division
Waldrum Specialties, Inc.

CDMS Label / MSDS Information  A comprehensive source for product labels and MSDS
PSU Pesticide Education Home Page

InvasiveSpecies.gov  The U.S. Government's Invasive Species Resource Site
Weeds Gone Wild: Alien Plant Invaders of Natural Areas
Wildland Invasive Species Program, The Nature Conservancy
www.invasive.org - Invasive and Exotic Species of North America