An example of some of the tools offered:
|•||Crawl info: Make sure Google has access to your site and see when Googlebot last visited. View URLs that Google has had trouble crawling and why.|
|•||Robots.txt file validation: See if Google is having trouble with your file, and test out changes to that file before you change it on your server.|
|•||Website content: View top content from your site and see the words that other sites use to link to it.|
If you haven't already, you owe it to your site to check out Google Webmaster Tools.