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Consumers don’t always buy something the minute they show interest in it. They may search for information, ask for recommendations, and browse around the web before making their decision to purchase. This is not that different either online or offline. It takes quite a few touchpoints with each customer before they actually buy from you. Since you’re not likely to buy something the first time you see an ad, Google is increasing the chances that you’ll click through on an ad by having those ads follow you around the web… which is a bit creepy.

If someone sees an ad on one site, Google can now show the same ad or a follow-up ad to just that person when they visit another site which shows Google ads. Since there are millions of sites in the Google Content Network, chances are Google will see them again. The program has been in beta since March, but it is now being rolled out to all AdWords customers. – Google Ads Will Now Follow You Across The Web (TechCrunch)