Copyright and fair use are a great concern for scholarship, publishing and teaching. Copyright law stipulates the rights and conditions authors enjoy over their works. Fair use guidelines describe circumstances and types of uses which would not be considered infringement of copyright.
PSU Copyright Website
This site includes PSU's copyright policy as well as instructional materials on copyright law.
OUS Intellectual Property Policies and Guidelines
Portland State University Office of Research and Sponsored Projects
Copyright Information Site - University of Minnesota
An excellent site with useful tools for determining when a use might be considered fair and when permissions should be sought.
Copyright Crash Course
A useful (and fast) overview of copyright law and rights published by the University of Texas Austin
In a nutshell
The sites listed above provide a lot of information about copyright law and policy. If you are looking for a very quick overview summarizing how you can use the intellectual property of others in your face to face classroom teaching, this chart is for you.
For consideration of using material in online courses, review the PSU Copyright policy with respect to the TEACH Act.