I'm not happy with the wordpress. Currently I have two Wordpress blogs, two Drupal content sites and one site with my own-programmed CMS. The last is worst, of course. But I'm constantly thinking about switching everything to the Drupal.
Latest reason about this is the handling of "permalinks" in the wordpress. It's quite painfull to switch from existing structure without loosing existing linkage scheme. At the same time, Drupal allows this increadibly easy...
Thinking, 37% done. There is not that much content in this blog, I hope converting into Drupal will be very easy.