I installed a fresh copy of Joomla 2.5.1, installed the CMigrator component and entered my DB info and 5 seconds later, I was done. All the categories and articles were in the proper place with the proper layout.
It actually kept the URLs intact for the images, since WP uses complete URLs for them. This is actually a good thing if you don't have time to update all the image URLs, you can simply move the image folder over to your Joomla site and clean them up later.
The only thing I see for now is the captions from the images are still in [square brackets] inside each blog post. But overall, I'm happy with it. Great Job on this Daniel!