Just ’cause, I’m posting a couple of links to some very useful CSS guides/tutorials. The first one is the CSS Slicing Guide which shows you how to turn your Photoshop built web layouts into somewhat compliant CSS layouts. This link was found via Digg.
The second is a step-by-step CSS Layout From Scratch which I found extremely useful. There are some great tips for creating navigation bars from a single image that therefore won’t break when a user increases the font size on the page. This link was found via searching Digg for the first link above.