Fair Use Checklist for Wilmington University provides a downloadable checklist.
Copyright.gov is the official government webpage where you can learn copyright basics and search for existing copyrights.
Digital Image Rights Computater walks the user through judging the intellectual property status of a specific image documenting a work of art, a designed object, or a portion of the built environment. Understanding the presence or absence of rights in the various aspects of a given image will allow the user to make informed decisions regarding the intended educational uses of that image.
Stanford University's Fair Use Site - a listing of charts and tools that assist in making sense of copyright designations.