Under Xcode 4 you can have a kind of Coverflow of your window-tabs by pressing: Cmd+Shift+Ctrl+Opt and Arrow Left or Right.
You can then open up the counterpart of the file (.h or .m) in a new tab of the editor using this shortcut or open it in a new window.
This is perhaps more curious than really useful, but if you use it, you can change the keyboard shortcut.
[crarko adds: Yes, this is kind of bizarre.]
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