Topics covered:
Color
Type styling
Weight and Scale
Structure
Grouping
Graphic Element
Imagery
Sound and Motion

Summary
Designing a web site, the importance of color is always overlooked by many web designers. But, keep in mind that we depend on our company and our company depends on your website and your website really depends on the color. Thus, the color should be one of your first concerns when the web site design. More difficult to read the text on the screen compared to paper and you'll have to choose colors that will work well. Through color you can make your guests feel comfortable, relaxed, confident and also surged.

Web browsers can only display 256 colors and even some browsers can only see 216 colors. If you want the colors you choose for your website, will appear for all people, exactly as designed by you then go ahead with the 216 color palette. Always use a color safe web browser.

Color combinations are also very important. Some color combinations are not as impressive as the Blue Text Yellow Background. That is why the black text on a white background is the color combination of the most easy to read. What can the purpose of any web designer? Clearly, to make web pages interactive and interactivity comes with the colors we choose for a web page. Color affects our feelings, our perceptions and our interactions.

If you are trying to create contrast with fonts you should avoid using two very similar font faces and sizes. The similarity of the fonts tends to create confusion and blur the design. However, it can be very effective if you make the font sizes very different, or mix the lightest version of the font in combination with the boldest.

2 links:
Principles of a good website design
Principles of a good website design: contrast, repetition, alignment, and and proximity

Color lovers
I think this is a really awesome website that have everything you want to know about colors.
It has pattern, palettes, trends, news. Totally a website for a color lovers.