[Screenshot of Douglas Bowman's presentation originally shown here.]
Microsoft's PowerPoint isn't a tool that will help you stand out anymore. It's simply de rigeur. That said, presentation tools aren't going away soon. Some key players in CSS have recently been using their talents to bypass the aforementioned proprietary technology entirely.
You may scoff at the idea of handcoding a presentation, but if you are fluent in CSS you can have a workable template in no time, using the very same assets you use for your company site. These presentations can be navigated non-linearly. Making your presentations on the web is, of course, a breeze.
Douglas Bowman of StopDesign has made his Web Essentials '04 Pushing Your Limits presentation available, and is it ever gorgeous. Even without a transcript, you get a sense of some great ideas at work. Two presentations, including the one above, can be found here.
Eric Meyer describes his S5 model in depth. Here is the demo presentation.