If you have links to large graphics, audio or video files, tell the user how big the file is so she can decide whether she has time to download it. Don't design your page too wide. Many users have monitors which only display 640 pixels wide. It's not nice to force them to scroll. Try not to make your page too long.
Web surfers hate to scroll down, too.
Consider using a white, light blue, or soft gray background for a very professional, simple look to your page and easy reading. Some combinations of text and background colors can be completely unreadable by people with color blindness. Different computer monitors will display the same color differently. Most search engines look at the page's title for indexing information. If your page doesn't ever change, it is stale.