Montage is a part of my work, now. While I've been using palettes for some time in sophisticated applications like Photoshop, palettes serve a central window. It's a montage of a central text with auxiliary, modifier windows. Since Tinderbox Weekend, I don't tend to have a central window.
I've been using simultaneously open windows much more consistently. I keep an outline of my categories for this site open so that I can cross-reference new writing easily with links; definitions are open in another window all the time so that I can write a new one quickly when I realize I'm not being clear; since the references to further readings have been growing nearly geometrically, I've generally got a window open to my "pending readings" where I'm dropping URLs from the web.
None of these windows is particularly central. There used to be one privileged window in the center with an explorer view on the whole document, but since I've wanted to have more than one text window open at a time, that has fallen out of my routine. Now there are windows all over the place, and the connections between them are central.
This behavior has bounced back into the other applications I use now. I frequently have my mailboxes window open in Eudora now, and several different OmniOutliner documents visible at once for different areas of my work. This would have seemed crazy to me not long ago.