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I've never seen anybody do this or heard anybody talk about it, so I figure it's worth mentioning. I found it by accident. ;)
If you go into the VS.NET development enviromnent, click a tab on the editing surface and drag it down; you get a dialog box asking if you want to add a new horizontal or vertical tab group. Pick whichever one works best for you. You'll get two edit windows/edit surfaces. It makes it tons simpler to compare code, copy code, etc.
Another fun one is double-clicking the "title area" of a docked toolbox. It undocks immediately so you can "do stuff" in a bigger window. Then, by double-clicking in the title area again, it springs back into "docking" position so you can reclaim all that screen space.
