Besides small business, what are the big companies using blog to market their products?

I’ve searched through the Yahoo Answers and found out that most of the blog marketing users are doing smaller or home business. I’m really curious: how many big brands have set up blogs and used them to interact with customers and even sell products through blogs?

Unofficial Apple weblog – http://www.tuaw.com/
Official Google Mac blog – http://googlemac.blogspot.com/
Apple student blog – http://education.apple.com/students/blog/
Official Google weblog – http://googleblog.blogspot.com/
Nike basketball blog – http://blog.nikebasketball.com/
General Motors blog – http://fastlane.gmblogs.com/

Did it help?