U.S. Department of State
United States Citizenship and Immigration Services
http://uscis.gov 
United States Citizenship and Immigration Services

U.S. Immigration and Customs Enforcement Arriving at a Port of Entry
http://www.ice.gov/graphics/sevis/factsheet/100104ent_stdnt_fs.htm
What a Student can expect

U.S. Immigration and Customs Enforcement Arriving at a Port of Entry
http://www.ice.gov/graphics/sevis/factsheet/100104ent_exchng_fs.htm
What an Exchange Visitor can expect

U.S. Department of State – Home Page
http://www.state.gov
U.S. State Department Home Page

U.S. Department of State - Bureau of Consular Affairs - How to apply for a Visa at a Border Post http://travel.state.gov/travel/tcn.html
Applying for a visa in Canada, Mexico or adjacent islands, automatic revalidation of expired visa

U.S. Department of State - Bureau of Consular Affairs - Links to United States Embassies
http://travel.state.gov/visa/questions_embassy.html
Link to U.S. consulate and embassies around the world

U.S. Department of State - Bureau of Consular Affairs - Visa Bulletin
http://travel.state.gov/visa/frvi_bulletin.html
U.S. Department of Sate, Bureau of Consular Affairs, Visa Bulletin.

U.S. Department of State - Bureau of Consular Affairs - Visa Services
http://travel.state.gov/visa
U.S. State Department Visa Services & Consular information

U.S. Department of State Visa Wait Times by U.S. consulate/embassy
http://travel.state.gov/visa/tempvisitors_wait.php
Visa Information for Temporary Visitors

U.S. Department of State - Bureau of Consular Affairs - Visa Services - Waivers of INA 212(E)
http://travel.state.gov/visa/tempvisitors_info_waivers.html
Information on the two year home country residence requirement