Attached Link: http://www.unc.edu/~haraszti/volumetrictut.html

Volumetric lights arent truly too difficult, those first links above are the best to look at. But, using the "volumetric world" settings in sky lab are not really advisable, the rendering times are just way too long, since they turn your ENTIRE world volumetric, not just one light ray. Also, here is a link to a tutorial to add in volumetric effects in Photoshop after rendering, might help. Check out the guys gallery, some great examples of post-work volumetrics. Agent Smith

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