Resurreciting an old thread here....
I've found the some of the current programs out there that will allow you to upload a 3D Model, and convert it to Lego:
LSculpt
BrickR
Brickify
But they all convert the 3D Model to only Bricks and/or Plates. Is there any out there that use Tiles, Slopes, Curves, etc. Basically the entire Lego parts library???
Bill