5 Rules of Web Site Design

Don't Upset the users
Keep Colors "SANE" i.e. no dark text on a dark background, etc. Also keep the links up to date, and descriptions accurate
Keep the Site Consistent
Avoid the pages from Outerspace. Each page should look similar to the other pages on the site.
Keep the Site easy to Navigate
If they go to another page in your site, make it easy for them to get back.
Avoid Clown Pants
Make the page design nice, and try to avoid using every font size and color, etc.
Avoid Monster Pages
Unless you really need all the information to be on one page, break it up and make it faster to download and find things on.