I've known about SlideShare for a while, but am just now trying it out on this blog, to compare with making slideshows in Flickr. SlideShare is to PowerPoint presentations what YouTube is to video. You can upload your presentations and others can view them on the web, download them, or embed them in a blog, like I did here. If you're reading this via an email subscription, you might have to go to my blog site to see the slideshow.
PowerPoint can be dangerous in the wrong hands, but maybe sites like this where people can vote and add comments, might encourage more people to learn to use it as a communication tool instead of a stun gun.