Personally Id like to think I know a good bit about Windows 7, I have been an editor here for over a year at this stage, but I always seem to be finding new things in it that make me feel like I know nothing. Youre probably all going to slate me in the comments now and say you already knew about these keyboard shortcuts, but for those of you who dont, I thought Id share them with you.
Now ill admit, for some of these it would be quicker just to use the mouse but for those of you who are keyboard enthusiasts, ready to learn every little trick, here you go:
ALT + P
In windows explorer, this shortcut will activate a preview pain of your selected file, it can be an image, document or even a sound or video file. Its quite handy and can replace the need for third party software.

Windows + Up and Windows + Down
If you want to quickly maximize a window, pressing the Windows + Up key will make it fill your entire window, and pressing Windows + Down will minimize the active Window.
Windows + Shift + Up and Windows + Shift + Down
When you use this 3 key combination, it will stretch the active window to the maximum desktop height, but the width will stay the same, pressing the Windows + Shift + Down combination will return it to its original dimensions.
Windows + Left and Windows + Right
This is basically the keyboard version of the aero snap feature. Normally you just drag a window to the left or right of your side and it resizes to that side of the screen. Well by pressing this key combination it will do the same thing depending on the direction of the arrow you choose.

Windows + Home
This will minimize every open windows except for the one youre using, so it performs the same function as aero shake, just press it again to restore the other windows.
Windows + T
The aero flip ( Windows + Tab) and (Alt + Tab) is one of the shortcuts most used by users, Windows + T will cycle through your thumbnails giving you a sneakpeak of them.

Windows + Number
You can launch new programs that you have pinned to your taskbar by doing the following, simply press the Windows key and then the number corresponding to that program on your taskbar, ie. 1 will launch the first program there.

Windows + Space
This performs the same function as aero peak, it will let you have a look at your desktop underneath if you press it
