Moving from Wordpress to Drupal
Jay Callicott has some tips, and even a distribution!, for those migrating from WordPress to Drupal:
We wanted to streamline the process to make migrating to Drupal as easy as possible in as few steps as possible. What we came up with is a small kickstart Drupal distribution that is easy to install, and includes step-by-step instructions on the homepage. The inspiration came from the Commerce Kickstart project, which attempts to make it easy for new users to get setup with e-commerce in Drupal.
The name of the Drupal distribution is Wordpress Kickstart. What we did was simply extend the functionality of the Wordpress Migrate module and added some additional modules to streamline moving all of your content over to Drupal.
The scope of this project is simple, we are not trying to create a Wordpress clone, built with Drupal (although that would be very interesting), rather a way for people to evaluate Drupal for themselves with their actual Wordpress content. This distribution could also be used as a base profile for users who are happy with Drupal and decide to stick with it.