One of the big problems with WYSIWYG editors is that they don’t really cut it. They look good in the beginning but as your experience grows, the editor tends to get in your way of getting things done.
Stackoverflow used an interesting solution: There is a wiki markup editor and a preview which is updated as you type. So you get the best of both worlds: You can see your intention and the result at the same time.
Riena is now following along the same path: They created a preview which updates when you save your UI code. That way, you can quickly see the effect of your changes without stumbling over tedious property editors all the time.