This paper has a number of potentially "difficult" scenarios residents might encounter when precepting students and ways to overcome them. Definitely a great source for the resident preceptor.

This website, from the University of Arizona, is a great resource for preceptors. It has everything from a sample syllabus and rotation calendar to helpful hints for preceptors. Also contains links to workshops about precepting.

A lengthy, yet thorough primer on mentoring including formal and informal mentoring and how to help set up successful mentoring programs.

This "monograph" has a nice outline of the basic components of precepting. Not the most visually appealing resource but the information is useful