ohashi beat me to it. That's almost certainly a website that you've visited using retargetting. More info: http://www.bizreport.com/2010/03/google_adwords_final

ohashi beat me to it. That's almost certainly a website that you've visited using retargetting. More info: http://www.bizreport.com/2010/03/google_adwords_finally_gets_retargeting_capability.html http://www.bizreport.com/2010/03/google_adwords_finally_gets... . Article starts out "While Yahoo, ValueClick and other ad networks have offered ad retargeting for some time, Google has only just released it to their AdWords customers after twelve months in beta."