Google Webmaster tools

This should be helpful. Do you have a website or blog that you'd like to track better? Check out Google's Webmaster Tools. They are free and easy to use, but if you don't know they are there, then they aren't much help.

Check them out here.

They can tell you:

-The most popular search terms for your site
-Site diagnostics like crawl errors
-How to get your sitemaps set up
-Why Google is or isn't indexing your site

And tons of other stuff. Highly recommended.