Today blogging-tools company Six Apart is upgrading its business-focused products, TypePad and Movable Type.
In the blog echo chamber, Automattic's WordPress gets a lot of the buzz, since it's open source, free, and led by the charismatic and young Matt Mullenweg (interview part 1 and part 2). WordPress' blogging software is well liked by its users, and there are a lot of people who know how to maintain WordPress installations. Automattic also runs WordPress.com, a hosted blogging service. TechCrunch and GigaOm run on WordPress.