It would be usefull to have an easy way of creating pop-up windows. Not those that just pop-up without warning but I mean the ones when you click a link to see an image in a larger size for example.
Now it's rather a huge hassle to get the properties of such a window right (size, location on the screen, menu yes or no, scrollbar yes or no, tools yes or no and so on).
Have you taken into account that microsoft is creating an update for Internet Explorer that will make visitors activate ActiveX controls? You might want to update Dynamic HTML Editor features according now you are working on it.