It's been said before, Apple knows how to get people's attention. We all knew that the iPhone announcement has generated a lot of buzz. I just never realized that it was $400 million worth of buzz.

Harvard Business School professor David Yoffie estimates that Apple has generated $400 million in free advertising. There's nothing like getting other people to market a product for you.

We're more than happy to keep forking over the free advertising for Apple. Just make us proud Steve. Don't let us down.

iPhone Generated $400 million in Free Publicity [via gizmodo]