While finding new and better ways to make media explosions, I ran into a 
serious in that scattering media objects cannot be illuminated by 
shadowless lights or by lights used in a light_group.  While I know that 
shadowless lights do some funny things, I tend to think that getting 
ignored by media is a bit much, and that the light_group problem is a 
blatant bug.

Example scene:
/*
  When rendered as is, the media is grey.  When rendered with light group
  and/or with shadowless enabled, the media will be black (unlit).
*/
camera {location z*3 look_at 0} plane {z,-5 pigment {checker rgb 1 rgb .3} 
finish {ambient 1 diffuse 0}}

//light_group {

sphere {0,1 hollow pigment {rgbf 1} interior {
    media {
        scattering {1, 8}
        density {spherical color_map {[0 rgb 0][1 rgb 1]}}
}}}

light_source {<1e6,0,1e6> 1 /*shadowless*/}

//} // end brace for light_group

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