Google Analytics - This is really cool

I just came across Google Analytics and it seems really cool. It provides a complete traffic analysis of your website for FREE !!! These traffic info forms the core for online and real world Ad campaigns of many companies. For eg, on analyzing the number of clicks on "Pay Bills online" link on a banking website, they wud try and push more marketing on the Bill Payment features as they relate that many people have got interested in that. Itz strange that Google is planning to provide such valuable, costly info for free. I am stumped.