Your site should be easy to navigate. Split the Web site into several parts if necessary. The easiest method is to just place a menu bar somewhere on the left side of your page (keep it in the same position for the whole site), but there are other options. Take a look at Volkswagen's Turbonium.com site, for example. A navigation system such as the one used on the Turbonium site looks great and is very interactive, but only works if a relatively small amount of information is displayed on the site. If InformIT used a navigation system like Turbonium's, you would be clicking for minutes before you could even get to this article! An expanding menu bar would be the best system to use on Web sites that contain a large amount of information and have many categorized pages.
Whatever system you use, it's always a good idea to put a link back to your home page on each page of the Web site; visitors should know that, at any time they feel a little lost or disoriented within your Web site, they can simply click one link and be able to find exactly where they are within the entire Web site layout.