A wysiwyg editor option (instead of just a textarea) would be very nice. Even just a simple Ajax version, like Wikiwyg, which is nice because you can flip between wiki an rich text, and edit pages by doubleclicking sections, rather than going into edit mode. Check out their demo.

I'm sure there are other toolkits out there, as well.

See AdvancedEditingShowcase, we already integrate FCK (but we're not distributing it).

-- JanneJalkanen