For those of you having an Adwords account, I wanted to let you know that Google released his new -- beta -- version of Analytics a couple of weeks ago and that its new features are impressive, giving you pretty much for free a traffic analysis sofware as powerful as any expensive tool available on the market.
New features include in-depth reports of daily traffic, an easy-friendly interface, keyword positionning but my favorite update is, by far, an improved Traffic Source function, which lets you analyze referring sites' traffic by keyword, landing page, etc..
Whether you already have a traffic analysis solution or not, I would recommend using the new Analytics, especially since it's free.