LaTeX Beamer and Prosper

Takes a few hours to catch on, but makes the most professionally typset documents with a large number of amazingly useful features not available from other types of presentation software. For presentations, consider the Beamer or Prosper document class. Lyx provides a simple interface to LaTeX. One great figure is the ease of outlining and navigating the entire presentation from within each slide. See an introduction here: http://www.latex-project.org/intro.html