Hi, just came across "Wikiwyg" - a what-you-see-is-what-you-get editor for wikis - while browsing the blogosphere.
After playing with the demo I found it to be an unbelievably good way to edit wiki text. A demo is available on the webpage at http://www.wikiwyg.net/
Perhaps the best feature is the double clicking to edit a page.
Its designed to be integrated into existing wikis.
There is a blog entry by one of the developers (Ross Mayfield) here: http://ross.typepad.com/blog/2005/08/wikiwyg.html
Would be awesome to have this in the already great dokuwiki. (I'm still trying to get over that new spell checking feature :)).