The Windows key might have started as something a tad bit redundant (considering Ctrl+Esc does the same thing) but the Windows Key is so much more.
I have already spoken about the Win+(1-9) to activate programs in Vista’s Quick Launch Toolbar and its transition to taskbar applications in Windows 7. Of course, everyone knows about Win+Tab activating Aero Flip 3D but there is more to this.
Here is one that really strikes me as super-useful. On Windows 7, you can now use Win+Up to maximize a window, Win+Down to restore a maximized window and minimize a restored one, Win+Left/Right to