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I just think Flash format from PowerPoint is really useful for online presentation.

You also could find another free way to convert your PowerPoint presentation to Flash movie by viewing this article:

http://www.webpronews.com/topnews/2005/09/02/how-to-convert-powerpoint-to-flash-manually

Of course, you are albe to choose some other 3rd presentation tool to convert your PowerPoint to animated Flash movie in one click. Such PPT2Flash http://www.sameshow.com/powerpoint-to-flash-pro.html#110 , you could go to its official website for more information.