These two sites offer good general overviews of copyright as it affects higher education and in-depth explanations of fair use:

• University of Texas “Crash Course in Copyright”

• Stanford University Copyright & Fair Use Center

This site addresses a number of additional scenarios involving fair use in course management sysytems:

• Fair Use Scenarios for Course Management Systems

These two checklist can help determine if a specific use falls into either fair use or the TEACH Act:

• LSU TEACH Act Toolkit

• Columbia University Fair Use Checklist

This chart will explain the complex determination of whether or not a particular work is in the public domain:

• When Works Pass into the Public Domain
  

• Copyright Term and the Public Domain

When it is determined that permission for a particular use is needed, the Copyright Clearance Center should be the first stop:

• Copyright Clearance Center