Scroll through taskbar icons. Want to cycle through all the programs you have open without calling up Flip3D (with Windows key+Tab, in case you'd forgotten)? Windows key+T will guide you through all of your open programs and let you see their window thumbnails, but won't change what the rest of the screen is showing.
Start a new instance of an app. Changes made to the taskbar mean that clicking on a program icon placed there won't automatically start up a new instance of it. Instead, clicking will just show you what windows of it you already have open. But if you Shift-click or click the middle mouse button on a program's taskbar icon, you can start up another instance.
Start an elevated instance of an app. You can run a program with administrative credentials even if you're not logged into an administrator-level account. Shift-Ctrl-click on a taskbar icon to open an elevated instance of that app.
Close a taskbar thumbnail. There's a red X icon in the upper-right corner of each taskbar thumbnail window that you can use to close that window. Want an even quicker way? Click the middle mouse button on it.
Restore the last active window. New taskbar groupings make it easier than ever to organize the programs you have open in Windows 7. But there's a way to speed up the process even more. Ctrl-click on a taskbar group to open the last active window in that group. Keep clicking to cycle through all the windows you have open.
Open a Jump List. One of the most helpful new features of Windows 7 are Jump Lists, which give you instant access to frequently used commands. There are two ways top open them: Either right-click on a taskbar icon, or left-click and drag it upward.
Arrange windows with Snap. Windows 7's new Snap capability lets you arrange your windows in several cool ways, depending on where you drag them on the screen. But you need your mouse. With any open window, hold down the Windows key and then press an arrow key to cause the appropriate Snap behavior. Use Windows key + Up Arrow to maximize the window; Windows key + Left Arrow or Right Arrow to make the window fill either the left or right half of the screen; or use Windows key + Down Arrow to minimize the window, or restore it to its original size if it's been maximized.
Make all open windows invisible. With Aero Peek, moving the mouse pointer to the lower-right corner of the taskbar will make all your open windows turn invisible so you can see straight through to your desktop. To do this without your mouse, press Windows key+space bar.
Minimize all but the active window. Sometimes the best way to clear your head is by clearing your desktop of everything except what you're looking at. This is easy to do in Windows 7: Hit Windows key+Home to minimize every window except the one that's currently active.
Move a window to another display. Multiple-display setups can be a great convenience, but arranging your windows between them is sometimes challenging. Not in Windows 7. Hold down Shift and the Windows key with either the Left or Right Arrow key to send the window automatically to the display (or projector) in that position.
Use the magnifier. If you're having trouble seeing portions of the screen, whether because of vision problems or because you're running at too high a resolution for a specific task, pressing Windows key+Plus key will start up Windows' magnifier option and let you zoom in on your display. To make everything look smaller again when you're finished, hit Windows key+Minus key.
Set projection options. If you're using your Windows 7 PC with a projector, you can easily change your display options by hitting Windows key+P. You'll be given choices to display on just your computer or just the projector, show the same thing on both, or extend your projection.