Google Offers Free Web Analytics Service

"Previously known as Urchin from Google, Google Analytics helps businesses use performance data to improve their online marketing campaigns and Web sites. The service provides information such as which keywords attract the most visitors, which e-mail campaigns generate the most customers and how to design Web pages that hold users' attention."

This is pretty neat, Google has integrated with AdWords which adds an interesting facet to your ROI metrics. It is indeed free, and you can track up to 50 websites (more if you combine "website profiles"). If you are familiar with the Google sitemaps setup and UI, this is even simpler to get going with. In 12hrs I'll be able to dig into the UI after Google has accumulated some data on the site(s) I've added.