Part of the process of my coming up with the original idea for Sandvox was seeing what CSS could do. I read Jeffrey Zeldman's book, Designing with Web Standards. And I was inspired by the CSS Zen Garden.
That was all a while ago, of course.
A few days ago, I came across a couple of online presentations that were actually published a year ago, by Douglas Bowman. They get a lot of the important across in a concise presentation.
The first is Beautiful Interfaces; the other (more technical) is No More Tables. This is the tastiest CSS Kool aid on the web.
The presentations themselves, BTW, are great testimonials. Take a look at any page of the presentation as HTML source. Or, drag this link [Toggle CSS] to your bookmarks bar, and click it when viewing a page of the presentation, to see what content there is when you strip away the presentation.