Matt Dawson of Category 4 goes into detail about your platform options for corporate blogging. These include WordPress (which I’d heartily recommend), ExpressionEngine and custom solutions. What about Moveable Type? I’m not a fan, but shouldn’t it be included as another major player in this market?
He talks briefly about CMS options. In this space, I’d say I’m intrigued by Drupal, although haven’t had time to test drive.