NOAA Office of Response and Restoration - site for those working to understand and mitigate the effects of oil and hazardous materials in marine environments. Includes a FAQ on oil spills.
EPA: Oil Spill Program - program for preventing, preparing for, and responding to oil spills that occur in and around inland waters of the U.S.
Greenpeace Arctic Action - warns of potential ecological dangers posed by oil development to Alaska and the Arctic. Includes a list arguments as to why not to drill, and an overview of the impacts of spills.
Exxon Valdez Oil Spill Trustee Council: 10-Year Report - provides information about the impacts of the oil spill, the injury and recovery of fish, wildlife, and people of the spill region, and information about ongoing restoration and research activitites.