Web 2.0 How-To Design Style Guide
“In this tutorial, I describe various common graphic design elements in modern web (“2.0″) design style. I then attempt to explain why they work (i.e. why they have become common), as well as how, when and where you might use each element in your designs. It follows on from my Current Style article, and analyses in greater depth the design features of the current Web 2.0 design style.” (Web Design From Scratch)