I have had the great fortune of stumbling across these audio works from Master NLP Trainer, Ed Percival. Ed is also one of the top business coaches in the UK.
These audios are pure gold, short and to the point. Listen carefully and do the exercises, you can easily "up" your performance, quickly! These have helped me as I was driving on the way to different presentations. No more "stage fright," and, Ed generously shares lots of cool NLP techniques for group persuasion and effectiveness on the podium.
Check out Master NLP Trainer Ed Percival's site here