Research study of Sitemaps Published, Google

Google has published a research study paper on Sitemaps “At the WWW'09 conference in Madrid, Uri Schonfeld presented his summer internship work studying Sitemaps from a coverage and freshness perspective. If you're interested in how some popular websites are using Sitemaps, and how Sitemaps complement "classic" webcrawling, take a look,” said Google.

More info: Sitemaps: Above and Beyond the Crawl of Duty