Presentation tools
Great PowerPoint slides don't make a great oral presentation. The visual presentation is based on the planned talk, and not vice versa.
The slides should be built to assist you with the presentation, and not be the main focus of your talk.
For good advice on presenting scholarly talks using visual tools, read Scientifically Speaking: Tips for Preparing and Delivering Scientific Talks and Using Visual Aids (Rhodes, 2005).
See the following pages for advice on commonly used presentation tools.