Resources
Check your case status
https://egov.uscis.gov/casestatus/landing.do
Immigration forms
http://www.uscis.gov/
Immigration Resources
http://www.usa.gov/Citizen/Defense/Citizenship.shtml
Visa Bulletin
http://travel.state.gov/visa/bulletin/bulletin_1360.html
Avoid Immigration Scams
http://www.uscis.gov/es/evite-estafas/evite-las-estafas-de-inmigracion