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Clearly Google's single usability expert was too busy to be involved in this project.

I wondered the same. The only conclusion I could come to is that they want to showcase this feature.

Based on the other comments on this one, the general consensus agrees that this is a bad idea though.

It doesn't work so well in a tiling WM: http://i.imgur.com/PXVzO.png.

Yeah, it's a bit silly as I seem to remember it was already doable in old IE before they locked down how you could access parent/child windows and it never failed to annoy.

If anyone can remember the sites that used to have a pop 'remote control' window for video.

I'm also sure my old work used it for wizards.