United States Citizenship & Immigration Services website - www.uscis.gov

Case Status- https://egov.uscis.gov/cris/jsps/index.jsp

Visa Bulletin- http://travel.state.gov/visa/frvi/bulletin/bulletin_1360.html

Case Processing Time- https://egov.immigration.gov/cris/jsps/ptimes.jsp

US Customs and Border Control: http://www.cbp.gov/

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

US–VISIT: http://www.dhs.gov/xtrvlsec/programs/content_multi_image_0006.shtm

Links to every US embassy worldwide: http://usembassy.state.gov/