A few resources on legal and ethical issues in teaching:

Copyright
As usual on this campus, the library provides a good place to start with "advice for the weblorn." The Crash Course in Copyright from the University of Texas is quite useful. The official source, of course, is the United States Copyright Office.
Accomodations and Access
This very useful set of questions and answers cover most of what a teacher needs to know. If for some reason, you want to read the whole code, it's readily available.
Privacy
The Family Policy Compliance Office of the Department of Education is in charge of enforcement FERPA, and they have a good explanation of the provision of the act as well as the actual regulations.
Personal Relations
I think the University of Iowa policy on sexual harassment and consensual relations is an excellent guide, and you may want to explore some of the other links the Office of Affirmative Action has identified.