Below are links to sample model releases. Remember, getting a signed release protects both you and the subject.

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Excellent information as well as samples :
http://www.danheller.com/model-release.html

About.com's articles on photography
http://photography.about.com/cs/businessforms/

Sample Releases:
http://www.dpcorner.com/all_about/releases.shtml
http://members.aol.com/kevinoneil/model.html
http://www.nyip.com/sub_idx_pgs/referidx/basic_model_release.html

Good collection of resources.