CSS Tutorials
Once you have the basics like CSS rules are contained within curly braces {} and are in the format of rule:property; then I would highly recommend using Firebug or Webkit's Developer Tools to see and edit CSS. Just go to any website, open up the tool, use the magnifying glass to click on anything that looks interesting, then see the CSS and change values to see what they did.
If you can wrap your head around the box model (one of the most confusing things about CSS...besides all the Internet Explorer bugs :) ) you will have no trouble with it.
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