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 popular web magazine published by Simpler Media Group. We provide news, advice and analysis for professionals driving digital customer experience strategy, evolving the digital workplace and creating intelligent information management practices. The CMSWire team produces 500+ authoritative articles per quarter for a community of over 750,000 market influencers.