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XCode already has a single-window mode. And as far as navigating multiple documents is concerned, it seems to work exactly the same as it does in XCode 4.

It looks from the screenshots that they are integrating interface builder into XCode and possibly (I'm hoping) the simulator as well? Even in "single-window" mode, you have to switch through multiple windows/applications in order to do development. The "build window", for instance, is unnecessary as it displays a lot of redundant information. A single window for layout, coding and debugging sounds useful to me.

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