General:

• Invasive Species.gov - A project of the National Invasive Species Council, this site includes the text of President Clinton’s E.O. 13112, the draft Invasive Species Management Plan, summaries of all state and federal invasive species laws, and links to the world’s best invasive species databases and websites. 
• Aquatic Nuisance Species Task Force - The ANS Task Force is an intergovernmental organization dedicated to preventing and controlling aquatic nuisance species and implementing the Nonindigenous Aquatic Nuisance Prevention and Control Act of 1990. This site includes background information on aquatic nuisance species, as well as the text of states proposed ANS Management Plans. 
• Smithsonian Environmental Research Center (SERC) provides scientific and policy research on environmental issues, including invasive species. 
  • National Marine Invasions Center is a project of SERC. The site includes background and research on marine invasive species. 
• The National Sea Grant Nonindigenous Species site is a national information center that contains a comprehensive collection of research publications and education materials produced by Sea Grant programs and other research institutions across the country on aquatic nuisance species. 
• National Governor’s Association - This site contains an issue brief that presents the environmental and economic impacts of invasive plant and animal species, federal efforts to address the problems, and some selected state actions underway.
• The Green Gate is Natural Resource Defense Council’s environmental guide to invasive species in the San Francisco Bay area. 

Reports:

• Defenders of Wildlife: Saving Biodiversity - Defenders of Wildlife’s report on state biodiversity law has been researched and written in the spirit of helping the states face the formidable challenge of conserving their natural biological diversity in the face of the accelerating loss of species and habitat. It includes a section on invasive species and state-by-state summaries of the management efforts across the country.
• U.S.Congress, Office of Technology Assessment, Harmful Non-Indigenous Species in the United States, OTA-F-565 (September 1993) - Commissioned by the House of Representatives, the report assesses the spread and harmful impact of invasive species, examines the gaps in national and state policies and regulations of invasive species, and recommends decision-making strategies and technologies for addressing the spread of invasives. An important and comprehensive report.
• Great Lakes Commission - The Great Lakes Commission is a binational agency that promotes the integrated and comprehensive development, use, and conservation of the water and related natural resources of the Great Lakes basin and St. Lawrence Sea Way. Membership includes representatives from the Great Lakes states and Canadian provinces of Ontario and Quebec. This site includes papers on invasive species management and legislation, including the report: Legislation, Regulation and Policy for the Prevention and Control of Nonindigenous Aquatic Nuisance Species: Model Guidance for the Great Lakes Jurisdictions.
• The Nature Conservancy: Americas Least Wanted: Alien Species Invasions of U.S. Ecosystems - This report lists and describes the “Dirty Dozen” of invasive species and the “Hardest Hit Ecosystems.” The author recommends coordinated management of invasive species between public and private organizations and federal, state, and local governments.
• Department of Fish and Wildlife. Invasive Plants: Changing the Landscape of America - Developed by Dr. Randy Westbrooks and the Federal Interagency Committee for the Management of Noxious and Exotic Weeds (FICMNEW), this fact book is intended to raise awareness of the destruction and economic losses caused by invasive plants in the United States, and encourages individual and collaborative efforts to respond to this threat to the integrity of the nation’s ecosystems.
• Natural Research Center: Predicting Invasions of Nonindigenous Plants and Plant Pests - This book analyzes the factors that shape an invader’s progress through four stages: arriving through one of many possible ports of entry, reaching a threshold of survival, thriving through proliferation and geographic spread, and ultimate impact on the organism’s new environment. The book also reviews approaches to predicting whether a species will become an invader as well as the more complex challenge of predicting and measuring its impact on the environment, a process involving value judgments and risk assessment. For policymakers, plant scientists, agricultural producers, environmentalists, and public agencies concerned with invasive plant and plant pest species. 

Funding:

• Environmental Law Institute - This site lists various grants available to states for invasive species management.
• National Sea Grant Office - Sea Grant is a project of the National Oceanic and Atmospheric Agency. The site provides research on marine issues, as well as information regarding their academic and government grant programs. 
• United States General Accounting Office: Invasive Species: Federal and Selected State Funding to Address Harmful, Nonnative Species - August 2000 report to congressional committees summarizes state invasive species programs.