The New York Times has published an article saying that large retail companies and telcos should be scared of Google. But I don't think it's Google they should be scared of, they should be scared of not having the right people working for them. The ones that understand the impact the internet in general is having on their respective businesses and how to take advantage of that.
"Google, then, may turn out to have a more far-reaching impact than earlier Web winners like Amazon and eBay. "Google is the realization of everything that we thought the Internet was going to be about but really wasn't until Google," said David B. Yoffie, a professor at Harvard Business School."