I once wrote an XML language to replace PowerPoint that had style sheet that turned my class outline into slides, but I have found a better way. HTML Slidy by Dave Raggett is a slide show about using XHTML to do slide shows. Dave has done a nice job at it using Javascript and CSS. My one problem is that the code is verbose – it needs a wiki crib language for quickly getting ideas out.
Another approach is to use Opera – see the Opera Show Tutorial. They have a online Opera Show Generator which creates the HTML for you. Neat.
Update, June 6, 2006. Bethany sent me a link to another neat web slide show system called S5: A Simple Standards-Based Slide Show System. Thanks.