   quick question about dx9/dx10 depth format
  Hi,I've heard that dx10 can support higher precision depth format than dx9?  is this true? As far as i remember, i used d24s8 in dx9 ... (24bit depth values with 8bit stencil)   
  No that's still the best precision available if you want stencil...you can use 32-bit depth if you don't need stencil but you could do that in D3D9 too.   