Bert Decker has a great (and easy) tip to improve your next presentation:  Use Black Slides.  According to Bert, a blacked out slide (as opposed to justing hitting the "B" key) accomplishes three things:

1. Clear the screen.  Once you’re done with the picture, graph or supporting information,you want to remove distraction, and go to a black slide so you canamplify, tell a story, or make an additional point, etc.

2. Black out the screen.  Simply put, so you can walk in front of the projector. Almost allmeeting, board and conference rooms are poorly designed so that theyhave the projector screen right in the middle of the room or stage. Itshould be at the right or left, so YOU can be in the middle. After all,YOU should be the center of your presentation, not your slides.

3. Totally change your mindset.  Change he creation and emphasis of the presentation. This is by far the most important of all, and needs it’s own paragraph.