NAFSA: Association of International Educators
The NAFSA web site offers many resources including the Advisor's Manual (order through NAFSA web site), Trainings (usually offered before conferences, but also sometimes there are special stand-alone sessions as well), E-Communities ( for members only, provides area for dialogues regarding issues)
http://www.nafsa.org

NAFSA IssueNet to get regulatory help  and or advice
http://issuenet.nafsa.org

Electronic Code of Federal Regulations
http://www.gpoaccess.gov/cfr/index.html

Department of Homeland Security
http://www.dhs.gov/index.shtm

U.S. Citizenship and Immigration Services
http://www.uscis.gov/portal/site/uscis  

U.S. Immigration and Customs Enforcement
http://www.ice.gov/index.htm
 
Department of State
http://www.state.gov/

Embassies in the U.S.
http://www.embassy.org/embassies/

Links to the U.S. Embassies abroad
http://usembassy.state.gov/

User Manual for School Users of SEVIS, Version 5.7
http://www.ice.gov/doclib/sevis/pdf/School_UM_Vol2.pdf

Access to SEVIS information and Help Desk
http://www.ice.gov/doclib/sevis/pdf/sevis_english_fs.pdf

Information about applying for U.S. visa
http://www.unitedstatesvisas.gov/

Information about higher education in the U.S.
http://educationusa.state.gov/

Information about going to Canada
http://www.goingtocanada.gc.ca/Going_To_Canada-en.htm

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

Social Security Administration:  http://ssa.gov/