Learn each month’s availability of immigrant numbers in the monthly issue of the U.S. Department of State’s Bureau of Consular Affairs’ Visa Bulletin.
The USCIS has launched a system for checking the status of a case pending at a Service center via the internet.
If you have your receipt number you can check your visa status at USCIS
100 Civic questions and answers issued by USCIS and MP3 Audio
If you are on a Non-Immigrant visa, then you should report your address change within 10 days from moving to USCIS.
Here you can find the lates USCIS fees