Volumetric light

I was just wondering how to create volumetric light.
Can anyone direct me to a tutorial or give instructions how to make it here.

Thanks.

There was this really good tutorial on the Blender site, but it’s down. :frowning:

How about this: http://mediawiki.blender.org/index.php/Manual/PartV/Volumetric_Light.

-Laurifer