Thanks to Vinny for this one, I just had to post it almost as is - a great repository of CSS goodies, not to mention the rest the site has to offer:

CSS is important. And it is being used more and more often. Cascading Style Sheets offer many advantages you don’t have in table-layouts - and first of all a strict separation between layout, or design of the page, and the information, presented on the page. Thus the design of pages can be easily changed, just replacing a css-file with another one. Isn’t it great? Well, actualy, it is.

Over the last few years web-developers have written many articles about CSS and developed many useful techniques, which can save you a lot of time - of course, if you are able to find them in time. Below you’ll find a list of techniques we , as web-architects, really couldn’t live without. They are essential and they indeed make our life easier. Let’s take a look at 53 CSS-based techniques you should always have ready to hand if you develop web-sites. - http://www.smashingmagazine.com

http://www.smashingmagazine.com/2007/01/19/53-css-techniques-you-couldnt-live-without/