S5: A Simple Standards-Based Slide Show System: http://www.meyerweb.com/eric/tools/s5/
Apologies to the original site which pointed me at this stuff: it’s so long ago I’ve forgotten where I read it first, but this (new ?) version is much improved and works very nicely indeed in Safari 2.0
Do try out the demo and try all of the keyboard shortcuts – after having to play with presentation software a few weeks ago (for the first time), I’m probbaly going to try re-writing my slides in S5 just to see how good it is for general use. Now I just need to automate the conversion into PDF (make sure the page breaks are honoured, etc.) and trivial stuff will be easy to knock up.
Not that I want to give another presentation. Ever.