Images of Broken Light

Go to https://www.google.com/webmasters/sitemaps/ where you can get some cool statistics about your site from Google. You will need to login and place a file on your webserver to confirm that you actually own the site.

Statistics include an overview of pagerank for your site, indicating the percentage of pages which have high, medium and low pagerank, as well as a listing of which pages the Googlebot could not reach. To which search terms your site scores high and which provide the greatest click throughs. Unfortunately there is no hard data as to exactly how your site is performing, but it could give a useful overview of where your site could do with some improvement.