[iBaker]

Sort of - say you have a site that uses forums, articles, videos etc. You could use a standard nav system that lists these areas for a user to click on and that selected section is then displayed - this is the norm.

However, a new site that I am developing would benefit if say a user moused over some text in the navbar and when doing so an image would roll open that had a graphical picture of the entire site.

Let's take for example a picture of a room that shows a picture on the wall, a newspaper on a desk, a tv in the corner etc. The user could click the picture on the wall (a hot spot) and the photo gallery section of the site would open, they could click the TV and the video section of the site would open, clicking the newspaper would open the Articles section etc. After the user clicks a hot spot in the image the selected section is displayed and the navigation picture closes.