A reminder from Bill Ives about the folks at Traction Software. They aren’t quite as visible in the general blogging market given their origins and focus on the enterprise market. Their tools, however, are robust and nicely bridge the fluid capabilities that make blogs and wikis such powerful tools for supporting knowledge work and the relevant management and security features that enterprises will generally require before deploying new tools and platforms.
If you are looking at enterprise blogging, Traction has to be on your short list. Regardless, if you are tracking issues of knowledge work in more general terms, you should definitely be monitoring their corporate blog.