Lots of articles are coming about touting business uses for weblogs: Blogs likely to gain place in business world, Blogs Begin Getting Down to Business, so it seems like a good time to remind folks about
We Blog: Publishing Online with Weblogs' Chapter 8, Using Blogs in Business. Lots of stuff in here about how and why to use blogs in a business setting. And it's all yours for free! You don't even have to buy the book to get it.