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Heh I this is like oldies but goodies weekend, first formats - then CSS.
I have never used CSS before, but I have been writing more HTML this weekend than in the past year, so I decided to find out what this CSS was all about. This link was quite useful - but I think CSS is easily learned by example and by hand, so combined with a few google searches - I was up and running with my first style.css file...
w3schools. (Score:1)
w3schools [w3schools.com] has some nice reference and learning material on (X [w3schools.com])HTML [w3schools.com] and CSS [w3schools.com] among other things.
Check 'em out.