Idea 3. Invisible taskbar - Search moved out of startmenu - centered
Again as mentioned: if MS is competing with google for real (from pcs to phones) they need the default main page UI to have search. It cant go in center of wallpaper (as it would wreck the look of family photos) but it could go in the center of the - invisible - bar.
I think there are some really good ideas in that concept by simplify things but what I really like on the current concept of Windows is the always visible taskbar: it shows me always what I am working on, I don't have to do something to get a complete overview. That is different from what you get on a real desktop or even on Mac OS X. And another powerful idea is, that you can reach everything from a known place with just one click, even if you are working on something (full screen mode).
BTW, this is the first Win7 concept that really shows some great ideas and smart thinking (like that a "real" Flip 3D doesn't make sense on a 2D display
But there are some issues /me thinks: instant search only would work if you are not in a different program (like Word or a browser), so the user always have to think "where is the cursor now? Can I type instantly or do I have to click/press something? In Vista it is easy: always press the Windows key! And how would you start an app without a keyboard (on a Tablet PC, phone...)?
Or what if I opened two images, with the bigger one on top. How could I reach the other image/window? Or where can I see how many images are open?