I am writing this on Writely which has impressed me with its WysiWig editing in JavaScript.
I have been doing a lot of architecture work lately using Confluence and discovered they have a Rich Text Editor mode.
It turns out that it, like Writely, does not support Safari as yet. I am using it in Firefox. But Confluence is using tinymce
(http://tinymce.moxiecode.com/) and it is cool.
One of the best things is that you can search within the page you are editing. Browsers do not support finding withing form fields,
which is what you are doing in the wiki editing mode. The ability to do this is huge. Writely also supports this. It is because I guess
it searches the DOM, and these tools write to the DOM as you type.