I know this may not help you too much, but I thought it interesting, particularly since I just saw it last night.

Tom Christiansen has a set of Perl tools that he uses for slide presentations instead of PowerPoint. The kit is called PerlPoint. I've never used it or even played around with it, but I thought it was worth pointing out/suggesting that you give it a look.

So take a look at PerlPoint, if you want.

Of course, this doesn't help you if you're not the person saying, "use PowerPoint." :)