Google Analytics is a must-have service for any website. Since their purchase of urchin, Google has constantly improved the service, offering everything from Adwords integration to segmentation. They've recently announced through their post Google Analytics Blog: More Enterprise-Class Features Added To Google Analytics a host of enterprise level features, including Adsense integration! I for one can't wait for this new service. Better adsense tracking is a must have for any content publisher. Kudos Google!