US State Department, Bureau of Consular Affairs:Consular services for United States citizens abroad. Visa services for foreigners, links to foreign consulates, visa fee tables and downloadable passport forms.
American Citizen Services: Provides U.S. visa information for applicants in Canada; as well as consular services and tips for American travelers.
How Stuff Works: Passport: Explains when and why you need a passport, and offers tips on how to apply for one.
National Center for Health Statistics (NCHS): Offers information for obtaining birth, death, marriage and divorce certificates required to obtain or update a United States passport. Includes links to publications and resources.
PassportInfo.Com: Provides a broad range of general information for Americans planning travel abroad, including passport information.
So You Wanna Get a Visa?: This article explains how to decide which United States visa you need, get the application, and prepare the evidentiary support you need for a successful application.
United States Ports of Entries: This Dept. of Transportation site includes the locations and other details about the ports of entries on the United States land borders.
Visa Appointment Reservation System: United States visa applicants may use this site to schedule an appointment at a United States consulate in Canada or Northern Mexico.