My blog is not based on Wordpress or Subtext or any of the others. Its something custom which I put together and occasionally add to or modify to suit my needs as they change. However, its written in PHP and as much as I like PHP for inspiring me to get into web development, in my opinion it has gotten a little tired. I intend to patch a few missing-but-essential features into the current version whilst I rewrite it completely based on Rails 3.
However, some would say I'm foolish for taking this route.