This fellow, Cliff Atkinson, runs a company called SociableMedia that specializes in marketing and communication around effective use of PowerPoint (no doubt the most maligned communication tool since the stick-in-the-eye.) Clif has a blog with some VERY useful content. Subscribed. Here's some of his articles on PowerPoint and effective communication.
Additionally, here are the ToastMaster's Top 10 Tips for Effective Public Speaking and a pointer to my "Scott Hanselman's Tips for a Successful [Technology] Presentation".
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