Canada

Government of Canada: www.canada.gc.ca
Canadian Border Services Agency (CBSA): www.cbsa.gc.ca
Transport Canada: www.tc.gc.ca
Canadian Environmental Assessment Agency: www.acee-ceaa.gc.ca
Canadian Importation Info: www.beaware.gc.ca
Canadian Food Inspection Agency (CFIA): www.inspection.gc.ca
Canada Immigration Services: http://www.immigrationdirect.ca/
Passport Canada: Canadian Passports
Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES): www.cites.org
Firearms Requirements: Canada: www.cfc-cafc.gc.ca (for info, forms etc)
Canadian Registrar for Imported Vehicles (RIV): https://www.riv.ca/ImportingAVehicle.aspx

United States

United States Government: www.usa.gov
U.S. Customs and Border Protection (CBP): www.cbp.gov
U.S. Department of Transportation (DOT): www.dot.gov
U.S. Environmental Protection Agency (EPA): www.epa.gov
National Highway Traffic Safety Administration (NHTSA): www.nhtsa.dot.gov
United States Department of Agriculture (USDA): www.usda.gov
U.S. Department of State: www.travel.state.gov
Form I-94: www.cbp.gov (Travel section, Travel Smart for info)
Form 3299: www.cbp.gov/document/forms/form-3299-declaration-free-entry-unaccompanied-articles
DOT Form HS-7: www.nhtsa.dot.gov/CARS/RULES/IMPORT
EPA Form 3520-1: http://www.epa.gov/oms/imports/documents/3520-1.pdf
Firearms Requirements: United States: www.atf.gov (Firearms section for info, Forms section)

Other Addresses

World Wildlife Fund (WWF): www.worldwildlife.org
Allied Van Lines: http://www.allied.com/