As Bill's mentioned, there are companies that allow you to incorporate PPT into
web conferences of various sorts.
GoToMeeting doesn't have anything that's PPT-specific, but it certainly enables
you to share just the PPT app from your computer with other meeting attendees.
You might also look at MS Producer ... it might solve at least some of the
problem for you, and it's free.
http://www.microsoft.com/windows/windowsmedia/technologies/producer.mspx
There's also MS Live Meeting. It offers a few different features from
GoToMeeting and, I'd assume, WebEx. And seems to be a lot more difficult to get
users hooked into than either of them. If it's free, it might be worth a
looksee. If it's more than GoTo, I'd GoTo GoTo. <g>
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PPT Frequently Asked Questions
http://www.pptfaq.com/
PPTools add-ins for PowerPoint
http://www.pptools.com/