As my two readers (hi mom & dad!) might have seen, I've been experimenting quite a lot with Javascript lately. Now I've come up with this, code I will most likely expand further in the future:

http://iron.randombase.com/wysiwyg/

Click on a created box so you can move it around, click again to freeze it in place. Later on I'll add things like resizing, colouring, images, text, ... it's all very easy actually. I have another experiment in developement now, the keywords are "alternative navigation". I'll post more about that later this week.