We are currently re-designing out intranet and are wrestling with the issue of screen space. Everyone wants a link to their site or information on the home page and in a top-most location on the home page.
Milissa points out that it is hard to find out where the fold is located. The combination of users settings of different screen sizes, text sizes and resolution ends up putting the fold in a different places for different people.
Her point is to use visual clues like cut-off images and to provide compelling content. People will scroll if they think there is something to find.