Remember Keynote presentations can be exported as QuickTime movies and Shockwave files. So that gets you some contemt useable on the web.joed said:...
I had also wanted Apple to dring out a web app, but I kinda think that if iLife apps get better web page export support, then I wouldn't need a whole separate app to do it - the Smart Web Gallery thing in Aperture looks really exciting and I hope iPhoto gets some of those features - in someway.
...
And Pages has an export as html. And with what you can embed in a Pages document, it's quite likely taht you can design some nice web pages in Pages. I haven't done that, so I don't know the restrictions.