Immigration:

–The USCIS Online
–Bureau of Consular Affairs
–U.S. Department of Justice
–U.S. Department of Labor
–U.S. Department of State

For travel and visa information:

http://travel.state.gov/visa/visa_1750.html

Federal Agencies & Resources:

–Social Security Administration: http://www.ssa.gov/
–IRS: http://www.irs.gov/

Bar Associations:

–American Immigration Lawyers Association
–NY State Bar Association
–Assoc. of the Bar of the City of NY
–American Bar Association