Great idea, but you have to work on that. Used Alice's 'Show Parent Folder' and looking for a substitute. Initial window is to small, when expanding, lower part disappears. Changing size to fixed size is bad anyway, should be modifiable by mouse. This would be first step, but probably some more work to do (read about problem with large bookmark tree: This is what I have). One point for acutal usability, a second one for motivation :-)