my company is running a lot of ecommerce and price comparison sites and we have developed a very accurate analysis tool that has decent click fraud detection capabilities.
Because we run most of our sites on drupal our tracking and analysis system integrates well with it (a drupal module).
If you buy traffic for your website (ads, search engines, traffic networks) you'll be able to detect the sources that deliver poor quality traffic or simply bot traffic and can react accordingly e.g. reduce your costs for incoming traffic.
As we are going to make our tool public soon (http://www.tsuiseki.com/index_en.html) I'd like to ask if there is any interest in the ubercart community for such a tool.
If there is interest we would like to have some feedback so we can modify the current drupal module to integrate smoothly with ubercart.