I tried out the ADM download and it does do an interesting outlining feature, as well as multiple document panes open at the same time. ADM seems to be full of bugs and the UI quickly gets visually complex.
I would still concur that it would be nice to have an editable master view (a la Word) of sub documents where I could move around the subs as objects in an outline/master metaphor.
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Kevin De Laere
UsableXperience
http://www.uxpr.com