37 Signals are a web design and usability firm based in Chicago. They've got a good prezzy introducing blogs, discussing blogging for business, and covering blogs as a business. They call Blogs "tiny but mighty cms".
Take a look: Blogging for Business
CMSWire is a leading, native digital publication produced by Simpler Media Group, Inc. We provide articles, research and events for sophisticated professionals driving digital customer experience strategy, evolving the digital workplace and creating intelligent information management practices. The CMSWire team produces 450+ authoritative articles per quarter for our 750,000 community members. Join us as a subscriber.