Presentations with LaTeX Beamer
I've been thinking about open source equivalents to MS Powerpoint recently and came up with a couple of good possibilities not including OpenOffice Impress. MagicPoint was the first that I found, it produces HTML presentations albeit via a unique scripting language. The second, and more promising option is LaTeX plus Beamer:
Beamer produces PDF presentations, although it is within the realms of possibility to convert these to HTML I came to the conclusion that a presentation should have a constant look and feel and so a PDF is more suited to the task than HTML as HTML is subject to the look and feel of the HTML render being used by the browser.
Another option that I just found is called TeXPower, however, this doesn't seem quite as full featured as Beamer: