Every so often I run across a link to the CSS Zen Garden. It's one of the prettiest webpages on the internet in my opinion. Make sure to use different styles, it's the same webpage, but with all sorts of different nifty layouts, all highlighting the niftyness that can be done with CSS.
Nifty ones:
http://www.csszengarden.com/ (Default)
http://www.csszengarden.com/?cssfile=081/081.css (One I like)
Thought I'd share with those who read this.