Beamer
I have to do a short presentation for Avrim's machine learning class as a final project -- I'm going to present Feldman's hardness result for learning conjunctions. Since I'm only going to have about 30 minutes, I figured that I should use slides of some sort, since writing everything on the board would just take too much time, and I'm just doing an overview anyway. The only other times I've use slides has been for various JP and theses presentations, and I've done all of them in Powerpoint. I decided to try something different for this one, though, so I'm doing it in latex using the beamer class. I've been very impressed. Beamer is surprisingly easy to use, and I think that the slides look better than powerpoint. Right now I have it using the Warsaw theme, but one of the great features is that you can completely change the look without changing the content by just using a different theme. And I'm definitely a fan of having TOC information in every slide like a lot of the themes do.