Here is a great video on how to preach without notes, which I think if very important for today's preachers. This is very similar to the method discussed in Hugh Litchfiled's book, "Visualizing the Sermon."
William J. Carl III Brain Technique for Preaching Without Notes from Tom Dykhuizen on Vimeo.
Dr. William J. Carl III, the President of Pittsburgh Theological Seminary and Professor of Homiletics, teaches the pastors of Presbytery of Los Ranchos how to take their preaching to the next level. Through his training in neuroscience, Bill has developed a technique for learning sermons and lectures that creates a “virtual teleprompter’ in front of you, allowing you to learn how to preach and teach without notes. Annual Pastors Retreat 2011, Malibu, California.