University of Chicago researchers find that blind children use gestures just as sighted people do
This article from the University of Chicago describes research that underscores the importance of gestures to communication.

Looking for the Lie 
This article cites a global study that found most people erroneously believe that liars avert their gaze when being untruthful. If a speaker averts his or her gaze, what does the audience believe?

The Advice Business: Models, Tools, and Techniques for Management Consulting, edited by Charles Fombrun and Mark D. Nevins (Prentice-Hall, 2003)
This textbook describes the value consultants can add to a firm. Bob Lilien and Copie Harris contributed a chapter on presentation skills best practices.