volumetric light? how to?

Hi, i’d like to get into volumetric light details, can someone give a good tutorial, page’s to check or some help about that?, I’d love anything helpfull you could refer me to!
Thanks in advance

try this

http://wiki.blender.org/index.php/Doc:Manual/Lighting/Volumetric_Lights

Looks like Yafaray can do it:
http://blenderartists.org/forum/showthread.php?p=1488139#post1488139

Thanks kindly.