Make sure your site has a working Back button.

Google AdWords requires that your web site allows users to return to the Google search results page or ad network with a single click of the browser's Back button. Double-check that this function is operational across browsers. Make sure you are using site analysis tools to track this kind of activity. If your user clicks back to Google, it means they didn't find what they needed or they didn't like your site. This information is very valuable in developing your web site strategy.