If you have ever done any major Photoshop or desktop publishing work, you know that adjusting the hue, saturation and lightness (HSL) values of colors is a quick and easy way to adjust colors, especially if you’re looking to adjust a color to make it a slightly different shade. Coming, in CSS3 is a whole new color model that will allow HSL colors to be used online. Why is this nice? The advantage of HSL over the current RGB model is that it is far more intuitive: you can guess at the colors you want, and then tweak. It is also easier to create sets of matching colors (by keeping the hue the same and varying the lightness/darkness, and saturation). Here’s an article that discusses it a bit more.