A newer (beta) version of the FCKEditorProvider for DotNetNuke has been made available:
http://www.dotnetnuke.com/Community/Forums/tabid/795/forumid/127/threadid/247501/scope/posts/Default.aspxIt finally integrates the newest version of FCKeditor, giving you much better styling support and various other features. So far, my tests have been quite positive with the new version.
One thing to note is the bothering "Red title" style, that is configured by default. If you wish to remove it, you can edit the fckconfig.js files located in the provider's "FCKeditor" and "Custom" folders. Just comment out the line that add the style to FCKeditor's custom styles, and you'll be rid of it.
Regards to Mauricio Márquez for his great work on the integration!