Putting a PowerPoint and Video together What is the easiest way to take a powerpoint or keynote presentation and a video of me giving the presentation and put the two together so that they can always see the slides and my video of me giving the presentation.

It would be nice if I could zoom into each and shrink the other has I wanted to focus on the slide or the presentation, but just being able to put the two side by side would be good enough!
You have several possibilities.

The easiest for you would be probably be using Screenflow. It allows you to record what happens on the screen (the presentation) AND the camera input. It also allows you to do some simple post-production, like focusing on the screen or on the camera.