A few years ago I had the distinct pleasure of sitting thru a 7 hour session with Shel Holtz presenting on the topic of using new media tools for all sorts of repurposing communications efforts. Besides getting to see Ray Kurzweil speak for 2 hours, Holtz's presentation was the best I've seen on the topic. So I'm going to review his book, co-authored with Ted Demoplous, blogging for Busines: Everything You Need to Know and Why You Should Care.
Now, right off the bat, some employees may contend that their blog is not used for business purposes, to which I ask...are you kidding? If you're talking about your company, you're talking about the business of your company, end of story.