Thanks to Ziyad Saeed from the forums, I have just committed his two plugins to our CVS repository that allows you to use the Xinha or FCKEditor WYSIWYG editors with serendipity. Together with htmlarea (bundled default) and TinyMCE, we now have a boast of WYSIWYG editors to use as your liking.
Note that the plugins only work with current 0.9 versions of Serendipity and you need to additionally download the WYSIWYG editor's. There are installation notes that tell you exactly what to do within the plugins. The plugins will be downloadable from CVS and Spartacus within the next 24 hours.
Thanks a lot, Ziyad!
- My Schizo Buddy am : Serendipity plugins