Google's Checkout is now integrated with Google Analytics

Google has launched additional support for Google Checkout merchants who also use Google Analytics. If you're using Analytics to know how site visitors find and interact with your site, now you'll be able to see conversions and revenue metrics for your Google Checkout transactions. All you need is to add a JavaScript call and a hidden field to each page that displays the Google Checkout button, and your Checkout conversions will automatically be tracked in your Analytics account.

If you're a Checkout merchant unfamiliar with Google Analytics, learn more here and for more on how to use Google Analytics with Checkout, go there http://googlecheckout.blogspot.com/2006/10/checkout-and-analytics-working.html