My Windows Shortcuts

1)Three-Key Shutdown: If you want to shutdown Windows really quickly without even moving your mouse, here's a simple tip.
Press the Windows key, "U" and then "U" once more. All that does is pull up the Start Menu, selects "Turn Off Computer", and then selects "Turn Off" from the following menu.
This has helped me a bunch of times when I've needed to shut my laptop down in a jiffy and run off.
(Not my best tip, but I'm still thinking...)
2)Execute full commands directly from the Run box with /k, like "cmd /k ipconfig"
3)Lock Computer Instantly
WinKey+L will lock your computer instantly.
You can also make a button to lock your computer! You can place it anywhere -- how bout the QuickLaunch menu.
Create a shortcut on your Desktop. Make the path:
rundll32.exe user32.dll,LockWorkStation
Name it Lock. Drag it to the QuickLaunch menu or leave it. This will lock your machine if you choose to skip the previously mentioned WINDOWS KEY + L.
4)I use this one a lot:
If you SHIFT+Right Click on a shortcut or program, you'll see the "Run As..." option that lets you run the program as another user, such as a user with administrative rights. It becomes even more useful when you run Internet Explorer as an admin user, since typing in a file path in the address bar(C:\ or \\server\share) turns IE into a Windows Explorer window. You can even get to the Control Panel from IE. Very useful for installing/uninstalling software as an administrator while a regular user is logged in.