U.S. Department of Homeland Security
http://www.dhs.gov/

U.S. Citizenship and Immigration Service
http://uscis.gov/

Infopass Online Appointment Scheduler
http://infopass.uscis.gov/

Change of Address Form AR-11
https://egov.immigration.gov/crisgwi/go?action=coa

Welcome to the United States: A Guide for New Immigrants
http://www.uscis.gov/files/nativedocuments/M-618.pdf

US Immigration and Customs Enforcement (ICE)
http://www.ice.gov/

Special Registration Information
http://www.ice.gov/pi/specialregistration/index.htm

The U.S. Customs and Border Protection
http://cbp.customs.gov/

U.S. Department of Labor
http://www.dol.gov/

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

Visa Section of the U.S. DOS
http://travel.state.gov/visa/visa_1750.html

U.S. Social Security Administration
http://www.ssa.gov/

U.S. Internal Revenue Service
http://www.irs.gov/

U.S. Consulates Embassies Abroad
http://travel.state.gov/travel/tips/embassies/embassies_1214.html

Employment Development Department (California)
http://www.edd.ca.gov/