If you've been pondering the idea of launching a corporate blog, you should check out a great article on Ad Age's Web site today: http://adage.com/digital/article?article_id=126326.
According to the article, just more than 11% of Fortune 500 companies have corporate blogs and only a handful have a designated chief blogger. The number of corporate blogs has risen slowly and steadily since the end of 2005, when 4% had any kind of blog.
Here at GFM, we've been working with a number of clients on developing a corporate blog strategy. While consistency and transparency still reign supreme in our opinion, this article makes a good point about fleshing out your reasoning for blogging (e.g. humanize the company) before the blogging begins.