Chrispcritters - 1:37 pm on Jun 25, 2010 (gmt 0)
They don't know that you searched for the company. You WENT to the company's website. They are using the recently new Google AdWords program that allows a google to cookie the website visitor to later advertise to them.
This is the disadvantages with that program. Advertisers need to find the right balance of reaching back out to their previous visitors. Too much, like you are seeing is annoying and a waste of their money. Asking a consumer every five minutes if they are now interested is not good for a company's reputation. But, here and there would once in a while might make more sense. Each company needs to figure out their own sweet spot.