Presentation Program w/ Equation Editor?

ElJefe asks: "I've got to give a presentation next weekend on my summer research. The paper that I wrote up has a lot of equations in it, and so will the presentation. I wrote the paper using Lyx, and really like its equation editing features. Unfortunately, I'm doing the presentation in Powerpoint, and it's equation editor sucks (although it's fine otherwise). You also can't embed equations in text; they have to be free-floating objects. Does anybody know if there's some sort of Powerpoint-like application, either for Windows or Linux, that can give me the usefullness of Powerpoint with the the freedom of Lyx (or even LaTeX)?"