Marketingprofs has a nice article on neuromarketing.

It is early days for neuroscience. But what research has been done has stirred up a considerable amount of interest in the idea of neuromarketing. It is being touted by some as the next big thing. If marketers can use science to locate consumers' "buy buttons," then we have gotten closer to opening the "black box" of the consumer's mind.

The best use of neuromarketing is in predicting behavior—spotting the advertisements that people remember, selecting the media format that works best and how what consumers actually do differs from what they tell focus groups. Other uses I have seen or read about include reactions to movie trailers, choices about automobiles, the appeal of a pretty face and visceral reactions to political campaign advertising.