PowerPoint karaoke--where people pick up random presentations from the Web and wing 'em in front of an audience--is no longer just for geeks, according to this article in the Boston Globe. Here's how it works, from the article:
I can't imagine you could use it in any formal way for a conference, but how much fun would it be to incorporate it into a social event? The article does say people have been using this at meetings, but doesn't explain how. But you all are creative, so I'm sure you can come up with something.