I've found this gadget called Google Webmasters Tools , former Google Sitemaps.
First you have to add your websites, and go through a verification of ownership process, where you may place meta tags in the html content to probe you are the owner. Once you have claimed ownership, you get to see very interesting data.
Of all the features it provides the most valuable for me is the query statistics report, where I get to see the the highest average PR for specific keywords my site has ranked. For instance I know now that From Uruguay has an average PR of 1 for the "uruguays time zone" query :S
I only wished they would integrate it with Google Analytics into one single app, leveraging the features of both. I've already filled in a request for that here.