I am working on integrating Glen Davies work with tinyMCE. I am getting reasonabley close now. I have made minor modifications to the moodle code so that an administrator can choose between no editor, the htmlarea editor, and the tinymce editor. I have done the integration in such a way that I have been able to leave all of the htmlarea code intact, while disabling it when tinymce is used. Doing it this way should reduce the need to fix modules that have htmlarea-specific code.  Currently I am working on hooking the htmleditor configuration interface up to the tinymce settings.  This should be complete in a few days.