Pretty cool proof of concept video for 10/GUI, combining multi-touch and a new approach to window management.
This feels like something Apple might ship with OS X if they didn’t have to worry about alienating existing users. I already tend to arrange my windows (and OS X’s Dock) horizontally, with application drawers on the left and the right for constant visibility when other windows are on top. Two hand, ten-finger multi-touch is definitely on the horizon.
Like wide-screen or two-monitor desktops, the primacy of the horizontal axis in 10/GUI takes full advantage of the human field of vision being much wider than it is tall. But I wonder how (and if) you can change a window’s width, and also how it would deal with smaller windows (like preferences dialogs).