If you’re not a subscriber to Jakob Nielsen’s Alertbox then here’s what you missed today: Information Foraging: Why Google Makes People Leave Your Site Faster (Alertbox June 2003)
Basically the article confirms what I’ve been saying for the past year. Do not hide your content under a bushel. Instead, make it compelling and make it easy to get to with a minimal of effort.
Humans are under less evolutionary pressure to improve their Web use, but basic laziness is a human characteristic that might be survival-related (don’t exert yourself unless you have to). In any case, people like to get maximum benefit for minimum effort. That’s what makes information foraging a useful tool for analyzing online media.
(note, the bold emphasis is Neilsen’s, not mine!)
In other words, give your purpose-driven users what their looking for, and remove anything on your site that gets in their way.