If you are a business owner, or work for a company that is thinking about blogging then read this excellent post by notable blogging guru and all around smart guy Dave Taylor:
Finally, your bonus question is when to start blogging for your business, and I would say that the best answer is start writing your business blog entries immediately. It doesn’t really matter if you’ve been in business for six months or aren’t opening the doors for another eight weeks: your blog is a way to get noticed, to gain visibility, to engage your current and future customers and to participate in the ongoing discussion in your industry. If you’re trying to gain visibility for both yourself and your business, why wouldn’t you get started as soon as possible?
You really should read the whole thing.