What do I mean when I say, static – blog? Since you can install blog software like wordpress into a subdirectory or into a folder making it part of your original website. This allows you to use one domain name which you may already have good ranking with.
Your can see examples of this at my sites Network Marketing Works and Nav60. When we look at CMS systems like drupal they also combine some what static pages with a blog.
Why is a CMS system semi static? Well for starters blogs and CMS systems are driven by a database making the setup just a little more difficult then a true static website.