Google has launched a new free servive called Analytics. This is based on Urchin but it now has features to improve AdWords ROI.
Learn how visitors interact with your website and identify the navigational bottlenecks that keep them from completing your conversion goals. Find out how profitable your keywords are across search engines and campaigns. Pinpoint where your best customers come from and which markets are most profitable to you. Google Analytics gives you this and more through easy-to-understand visually enhanced reports.
Available in English, French, Italian, German, Spanish, Dutch, Japanese, Korean, Simplified Chinese, Traditional Chinese, Portuguese, Danish, Finnish, Norwegian, Swedish, and Russian, and seamlessly integrated with AdWords, Google Analytics provides the actionable information you need to improve your site content, optimize your ad campaigns, and boost your ROI.