I speak often at WordCamps and other events, and I've struggled to find just the right presentation system.
PowerPoint is great, but there's no effective way to share my content with attendees. Tools like Showr and Deck and Prezi are fun, but take too long to build - they're too technical. Sites like SlideShare are great for distribution, but I hate giving my content to third parties.
Being able to host my own presentations, within WordPress, with a snazzy what-you-see-is-what-you-get editor tool? Fantastic. I used the early alpha versions of the plugin for a couple of WordCamps, and expect this to become my go-to tool for everything in the future!