Remarketing is a process whereby you put a little code on your web site... buy a program with Google Ads or another ad network and then whenever that shopper is surfing the web your ad keeps reappearing.
What's more the Analytics are all built in. Google has the easiest program
Here is an article showing a step by step approach to how to do this with a simple Google Adwords account
http://tinyurl.com/remarketing101
Here is another simple article giving you the simple story on this very powerful technique of being in front of the customer when they are ready to buy your type of product.
http://tinyurl.com/Remarketing102
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Thanks to
Ron Jones | August 23, 2010 article in .clickz.com