Snap Any Window to Half the Screen Size in Windows 7

Nowadays everyone have one of them widescreen computermonitors.
Mine is about 24 inch and sometimes I jsut want to put 2 windows next to each other to compare some data.

I you are using Windows 7 then this is very easy:
Activate a program/window and use Windows-key + left/right-cursor key.
Windows-key with cursor-up brings the windows backt of full (max. size) and cursor-down makes the windows a floating-windows.

Beware ;-) : This a Windows 7 only feature.