This article is from the FAQ, by with numerous contributions by others.
INS, USIA and State Department all have their web sites now.
PS: If you have any questions about gopher and anonymous ftp
PLEASE don't ask me. Ask on news.newusers.questions
NAFSA (the association of international educators) regularly
sends out updates about changes in immigration laws to its
mailing list, firstname.lastname@example.org (you can subscribe by sending
mail to email@example.com). An archive of these updates
(which may be useful to you) is accessible by gopher at the
following place: http://www.nafsa.org
A source of immigration information that's especially
useful for people from Russia and CIS.
It has now moved to http://www.siber.com/sib/
There are also several government and private web sites.