Stencil Shadow Volume using HLSL

Working on the opimization about the shadow rendering and learning HLSL these days, just hope to make these two things cooperate with each other.
The tranditional way of making a shadow volume take a lot of CPU time and vertex shader can solve these problem .

Check the NVidia SDK 9.5 on Shadow Volume, they got a pdf to illustrate the idea of how vertex shader can ease the life of programmers.
But the problem is we need a tool to generate the "ghost" polygon Or we have no way to use the SM 3.0 to accelerate the developement step.

Maybe we need to wati util SM 4.0 comes with NV 8 series....