It's pretty easy to Figure out where your web traffic is coming from, but which of those streams are actually producing the most conversions? If you are relying solely upon the conversion tracking in Google AdWords, or any other cookie-based system, then you will almost always be missing a lot of conversions.
The Google AdWords cookie only LiVES for 30 days. So, if a customer clicked one of your ads 31 days ago, and just ordered something today, AdWords misses the conversion. How often does that happen? It depends upon what kind of business you have.
How it Works
No matter how long ago a customer found your website, or by what means, their arrival is somewhere in your server logs - usually with precious "referrer" information. So, what you do is load your server log into ConverTastic each day. Then, when you make a conversion, you Get The IP address of the customer from your shopping-cart system and plug it into ConverTastic's powerfull search tool.
If the customer has had the same IP address for a while, ConverTastic can find their arrival in seconds. If the IP address has changed, you still have a good chance of locating the arrival with a series of searches.
Once you locate the customer's arrival, you will usually know how they found your site. You will either see the AdWords ad they clicked on, the site they linked from, or the page on your site that they found with a plain web search. You may discover that a high-traffic page on your site doesn't result in many conversions, or that a low-traffic page is actually very profitable, etc.
