Powerpoint is a common tool used for speeches and presentations. If used properly, it can strengthen your presentation. If improperly used it has the potential to distract from an otherwise excellent speech.
Here are a few excellent videos to help you create better powerpoint presentations.
There are a few key principles to good powerpoint design. In this TED Talk David Phillips explains how to avoid "Death by Powerpoint" by teaching you the best techniques for your design. It is an excellent, entertaining talk, and you are sure to discover a few surprising ideas along with way.
Unlike the name suggests this video instructs you on how to create a powerpoint by telling you what not to do. If you want to see how a bad techniques can influence a good presentation, watch this short, humorous video:
This is a great video that delves into other issues not covered in the videos above. From fonts to colors, this four minute video provides a concise analysis of what details you should care about as you construct your Powerpoint.