I have three items related to PowerPoint. The first is the short article by Edward R. Tufte called "The Cognitive Style of PowerPoint." One of his arguments is that PowerPoint cannot contain the amount of information that is needed when making presentations.
http://www.amazon.com/exec/obidos/tg/detail/-/0961392150/qid=1114548958/sr=8-1/ref=sr_8_xs_ap_i1_xgl14/104-0060856-3456763?v=glance&s=books&n=507846
The second item is an online presentation of "Effective Teaching with PowerPoint: A Learning Theory Approach." This builds on Gagne and other cognitive scientists to create some simple rules that should be applied when using PowerPoint if you want to help students learn from the slide shows.
http://www.educause.edu/PopularContent/2658
The third item is a Microsoft Press book by Cliff Atkinson titled "Beyond Bullet Points: Using Microsoft PowerPoint to Create Presentations that Inform, Motivate, and Inspire." This book provides a thorough explanation of story telling and then applies it to PowerPoint presentations. Your presentations will not be the same after going through this material.
http://www.microsoft.com/MSPress/books/7125.asp
These all fit together as a call to reevaluate our uses of PowerPoint.
