A new feature in Windows 7 is the ability to “snap” a window to the left or right of the screen, for side by side viewing.
You can, of course, just drag the window to the side you want, but what if you don’t want to use the mouse? Well, there’s a keyboard shortcut for that!
Windows Key + Left Arrow
Windows Key + Right Arrow
By pressing the Windows Key with either the left arrow or right arrow, the current window will snap to whichever side you select!
If you keep pressing the same keyboard combination, it will go round in a circle. So, if you keep going left, it’ll snap to left, then right, then back to normal again. If you’re lucky enough to have a multiple monitor setup, it’ll cycle through all of the monitors in turn.