I'm coming to the conclusion that the culture of a company will make a blog successful or not. If a company's culture really does follow the cluetrain manifesto, and open up, and listen to customers. If that company uses blogging it will really help a company. If a company continues to do the same things and blog, I don't know if a blog will really help all that much. Basically, management of companies might understand that the act of blogging is not a panacea. And company is a company people, who also happen to be employees. Those people will excel only if you let them. Most companies don't allow their employees to excel. Those that do are the best candidates for corporate blogging. Say what you might about Microsoft, even with the court case, the company must actually let its employees excel, and that's one reason why blogging has proven so successful for them.