You can do searches on Google like “site:lagesse.org privacy” that will only show you results for this site that relate to privacy. It’s really handy if you know you saw something on, say MSNBC. You can do a “site:msnbc.com whatever_you_forgot_about” and the chances are VERY good you’ll find what you wanted.
What would be interesting is to know how those results compared to a non-site specific search. For instance, in the search of my site I mentioned above, it would be cool to see where my results were on Google general search rankings, but they don’t show that.