We're living in a world now where consumers are bombarded with thousands of commercial messages - they're everywhere you look. Unless you can cut through that and engage someone, I think you are lost. Consumers are now clearly in control. They control what they hear and see, when, and where. You have to find ways to allow them to actively engage with you, or the money you spend is wasted.
Source: Interview with Ogilvy and Mather CEO Shelly Lazarus: http://money.cnn.tv/magazines/fortune/fortune_archive/2007/09/17/100258877/index.htm
Contributed by: ~C4Chaos