PSDTuts - Photoshop Tutorials and Links - 9 Essential Principles for Good Web Design

Web 2.0 how-to design style guide
PSDTuts - Photoshop Tutorials and Links - 9 Essential Principles for Good Web Design
You may also wish to base your designs on a specific grid. I must admit I don't do this consciously - though obviously a site like PSDTUTS does in fact have a very firm grid structure. This year I've seen a few really good articles on grid design including SmashingMagazine's Designing with Grid-Based Approach & AListApart's Thinking Outside The Grid. In fact if you're interested in grid design, you should definitely pay a visit to the aptly named DesignByGrid.com home to all things griddy.