Blogging for Business: From Small Business Computing, a nice profile of how the 8-person design firm Coudal Partners use their weblog as a business tool.
But the blog was really an exercise in industry networking — and only later about building an audience for the spin-off businesses. Coudal.com talks about the things design and creative professionals care about. All eight firm members write to it, posting as many as 25 usually short entries a day, often simply pointing visitors to something interesting spotted elsewhere on the Web, along with a brief comment.
I have CP as an RSS feed in a folder of fun stuff I look at evenings or weekends.