OK, so I spend 2 hours rounding the S. Here is the result, rendered 
without radiosity and with photons. (Changed light source position also.)

What do you think?


By the way, I would like to share with you the scene description of the 
letter "S" object:

#declare ObjectS_Top =
merge
{
   difference
   {
     merge
     {
       difference
       {
         merge
         {
           cylinder {<0*cm, +2*cm, -1*cm>,          <0*cm, +2*cm, 
+1*cm>,          3*cm + Radius} // Outside (Middle)
           cylinder {<0*cm, +2*cm, -1*cm - Radius>, <0*cm, +2*cm, +1*cm 
+ Radius>, 3*cm}          // Outside (Edges)
           torus {3*cm, Radius  rotate +90*x  translate <0*cm, +2*cm, 
-1*cm>} // Front outer rounding
           torus {3*cm, Radius  rotate +90*x  translate <0*cm, +2*cm, 
+1*cm>} // Back  outer rounding
         }
         cylinder {<0*cm, +2*cm, -2*cm>, <0*cm, +2*cm, +2*cm>, 1*cm - 
Radius} // Center
         cylinder {<0*cm, +2*cm, -1*cm>, <0*cm, +2*cm, -2*cm>, 1*cm} // 
Front edge
         cylinder {<0*cm, +2*cm, +1*cm>, <0*cm, +2*cm, +2*cm>, 1*cm} // 
Back  edge
       }
       torus {1*cm, Radius  rotate +90*x  translate <0*cm, +2*cm, 
-1*cm>} // Front inner rounding
       torus {1*cm, Radius  rotate +90*x  translate <0*cm, +2*cm, 
+1*cm>} // Back  inner rounding
     }
     box {<0*cm, -5*cm, -2*cm>, <+5*cm, +2*cm, +2*cm>} // Cutout
   }
   sphere {<+1*cm, +2*cm, -1*cm>, Radius} // Front Left  Corner
   sphere {<+3*cm, +2*cm, -1*cm>, Radius} // Front Right Corner
   sphere {<+1*cm, +2*cm, +1*cm>, Radius} // Back  Left  Corner
   sphere {<+3*cm, +2*cm, +1*cm>, Radius} // Back  Right Corner
   cylinder {<+1*cm, +2*cm, -1*cm>, <+3*cm, +2*cm, -1*cm>, Radius} // 
Front Edge
   cylinder {<+1*cm, +2*cm, +1*cm>, <+3*cm, +2*cm, +1*cm>, Radius} // 
Back  Edge
   cylinder {<+1*cm, +2*cm, -1*cm>, <+1*cm, +2*cm, +1*cm>, Radius} // 
Inside  Edge
   cylinder {<+3*cm, +2*cm, -1*cm>, <+3*cm, +2*cm, +1*cm>, Radius} // 
Outside Edge
   box {<+1*cm, +2*cm - Radius, -1*cm>, <+3*cm, +2*cm, +1*cm>}
}

#declare ObjectS =
merge
{
   object {ObjectS_Top}
   object {ObjectS_Top   rotate 180*z}
}


The final object contains 8 spheres, 18 cylinders, 4 boxes and 8 torii. 
That's a grand total of 38 objects.

...you can see why I only placed 19 of those by hand, and had POV-Ray 
duplicate the rest for me! >_<

Note also the multiple levels of merges and differences necessary to 
achieve the correct effect. (The innermost part is nested 6 levels deep! 
Eeeps!!)

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