I have cleaned up my Powerpoint presentation and added my narration on the notes pages. I have this available both as a .ppt file as well as a pdf. The pdf, I think, works particularly well -- it looks and reads more like a book. This is my best current cut at presenting the science of the skeptic's position and mostly supersedes my earlier book. Right click either to download. You are welcome to use the presentation with your own local groups.
Some example pages: