The Authors Alliance has released Fair Use for Nonfiction Authors.
Here's an excerpt from the announcement:
The guide addresses three common situations faced by nonfiction authors in which fair use may apply: 1) criticizing, discussing, or commenting on copyrighted material; 2) using copyrighted material to support a point made in the author’s work; and 3) using copyrighted material for non-consumptive research. It also addresses the most frequently asked questions about fair use and clears up some common misconceptions about when it might apply.
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