A few months ago I went to hear Carl Smith give a talk about Google Analytics. It was interesting, to see how a consulting shop was using the information they were getting from Analytics to tailor their website to adjust to how people were using it. For example they would check out the click path of customers that they were about to go give a demo for and see which area they were checking out and tailor their presentation around that also.
Since Carl's talk, Google has overhauled the original Urchin interface for the better, and I have to say it is also noticeable faster. If you have a website and are not using Google Analytics you really should take the time to look it over. After all, it is free.