> The fog is necessary to create the nice 3D depth effect.  I suppose there 
> is
> no way to replicate this effect and also maintain transparency?

You can use gradient color maps to create a similar effect without fog.

// Depth Cue Red
#declare DC_Red = texture {
   pigment {
      gradient z
      color_map {
         [0 color <1,0,0>]
         [1 color <1,0,0>*0.05]
      }
      scale 2.1
      translate <0,0,-0.1>
   }
   finish {
      ambient 0.2
      diffuse 1
   }
};

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