Google has added a new tab, a tab they have been beta testing for a couple months, named Site Diagnostics. What this tool does is show you which pages the AdSense crawler is having problems getting to. Why would they crawler have a problem getting to those pages? The several possible reasons include a robots.txt file blocking then, password protected pages, server down or slow and other reasons explained in the AdSense help pages.
I have posted screen captures at the Search Engine Roundtable.
The Original Search Marketing Event is Back!
SES Denver (Oct 16) offers an intense day of learning all the critical aspects of search engine optimization (SEO) and paid search advertising (PPC). The mission of SES remains the same as it did from the start - to help you master being found on search engines. Early Bird rates available through Sept 12. Register today!