What can professional blogs do for businesses and organizations?

If a business or organization puts out their blog on websites and other such sites, then it will bring customers to their site and eventual be able to serve them. When my wife and I was looking for someone to make our wedding cake, we found numerous blogs about cake making businesses. I thought this a very effective way to get a business' name out. This is also an effective way for people to ask questions about a business and get personal feedback. I have also spoken with some small business owners and they are very satisfied with the help their blog gives them.