The Basics of Navigation

You can have all kinds of great attractions on your site, but if your visitors don't know how to get to them, they'll just collect dust on the server. Worse yet, if visitors find your site's navigation confusing or convoluted, they'll simply give up and head off to explore the rest of the Web, never to return. So, good navigation design is an essential ingredient for any successful Web site.

Timberlake, Sean. EFuse (2000). Design>Web Design>Information Design