Now there is absolutely no reason not to do web traffic analysis with the launch of the free Google Analytics service. Note that you don't have to be an Adwords customers to use the service. Even better for Yahoo Store merchants, the tracking code can be installed in a matter of minutes. After you sign up for the service you will see some very simple Javascript code. Copy and paste this code into the Head Tags variable in the Variables page of the Store Editor. The tracking code will automatically be put on all pages. Finally, check back in a day or so in your Google Analytics account for data to start coming in.
It seems that you can also do conversion tracking for your Google Adwords campaigns. I have also read that you will soon be able to do Yahoo Search Marketing (a.k.a Overture) tracking.
