I got 2 solutions for you so far. (:-| of course If i`m not too late, or for somebody who still doesnt know how to solve it)

First one is a program, which will convert your presentation to video or flash. I have converted many PowerPoint presentations, so I found an application that combines all the features I want into a package that's priced in a budget that makes sense for most projects. The Presentation_to_Video_Converterapp does the best job I've seen for a fairly pricey $199.(There are many different discounts also). One advantage to this app is the ability to convert PPT slideshows with or without PowerPoint installed on the converting PC.
And also there is feature to burn PowerPoint presentation to DVD, which is fery useful now for everyone.

And The second one.
Soon will starts a brand new service of online converting with following webcasting ar www.vidflash.com I thought its the exactly what was asked. So you upload your presentation, convert it to flash (or not convert) and share. I have tried to convert my video. I have uploaded it and convert, but I could not yet download the converted file because the service isnt working in a full-mode. There was said that it will starts soon. Everything is aviable only for reistered users. The registration now is free. So you better hurry up.

So that`s what I know.