Here's my presentation software of choice:
The Debian package is named 'latex-beamer'.
The output is beautiful, it's well documented, and I love being able to prepare a presentation in Xemacs. acroread makes a pretty decent presentation app, too, which I didn't know until I tried it. My only gripes are related to PDF, not LaTeX-Beamer itself: I don't like opaque binary file formats and I wish I could use something like ggv instead of acroread for the presentations, but for me, anyway, ggv just doesn't work very well on many PDF files.
I believe you can produce formats other than PDF, anyway, but I recall having some problems when I tried that and I was rushed for time.
I used this software for a presentation I gave back in March, after having tried Pointless two years ago at SIGGRAPH. Pointless isn't bad, and it's a lot more quick-and-dirty, but the output of LaTeX-Beamer is much nicer.
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