iSpring - converts PowerPoint presentations into Flash - which can be then embedded into your website.
iSpring Free converts your PowerPoint presentation with all external resources into one solid Flash movie. With iSpring Free you can generate .html code ready to place an .swf file on your web page or blog. iSpring wraps Flash slideshows in the attractive Player for effective navigation. iSpring supports automatic and mouse click animation step advance and looped playback.
All iSpring Free functions are accessible in your PowerPoint through the standard toolbar. Just click Quick Publish and iSpring will generate a Flash movie form your PowerPoint presentation in a few seconds.
Another free tool that allows you to host and share your PowerPoints is SlideShare.
SlideShare is the best way to share your presentations with the world. Let your ideas reach a broad audience. Share publicly or privately. Add audio to create a webinar.
SlideShare is more like YouTube; they host your files and provide code to embed the presentations in your website. Where as iSpring, gives you the flash files which you can then host how ever you like.