Adsense using Site Authenication

For a long time the Adsense crawler has had problems reaching sites that are password protected, but not anymore. Google is offering site authentication through Adsense that allows you to enter your authentication information into Adsense, and this will allow the Adsense spiders to crawl freely through your password protected site.

This is great for those private forums that require you to provide authentication before viewing, and will allow Adsense to provide relevant ads based on the data on the pages.