Persuade users to use them less. See Edward Tufte for more on this.
http://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=0...
http://www.wired.com/wired/archive/11.09/ppt2.html
Peter Norvig has a funny take on this too.
So no, I will not contribute. Not because I have anything personal against you, OP, but because I think it's odd to ask the question and even stranger to reply with actual, usable content.
I know that may seem strange to some but that's okay; it seems strange to me that (a) you would ask, and (b) there are people who would respond with tons of great quality ideas that could be executed by MSFT/Apple/etc in their next release thus nullifying the potential for a small company to build "the next generation of presentation aids".
If it's still eligible for deleting you should do that now.
For God's sake man, you're the founder of an education resource!
I think you are off on this one and, if there was an award for "Best overreaction of the day", I'd nominate your post.
I would say there are 4 key components to presentation:
1. predetermined agenda/topics for discussion (what people use powerpoint for)
2. ad-hoc discussion (whiteboards are a great tool for this)
3. verbal communication (in-person or phone)
4. non-verbal communication (in person or video)
To beat powerpoint in functionality, just have #1 + (2 and/or 3 and/or 4).
To beat powerpoint in marketshare...?
Also keep in mind that 3 and 4 are largely being met with products like gotomeeting or webex (and others). No one is encompassing all four as far as I know, so there could be something there.