Once can use add-on’s to provide WYSIWYG editing in MT.
Here are few nice links that I found by doing a general google search, I would prefer using tinymce integration, since it is tried and test in number of apps.
http://plugins.movalog.com/enhancedentryediting/
http://www.movalog.com/archives/hacks/htmlarea
Filed under: MovableType
