This might not sound like a Big improvement...
But I ran some of the updated demo's
Stencil Shadow Buffer - Now I have both DirectX8.1's and DirectX9.0's
640x480x16bpp Fullscreen Rasterised | 38-42fps
1280x960x16bpp Fullscreen Rasertised | 40-46fps
Impressed really isn't the word, especially as this is on my Laptop
Celeron 600Mhz | GeForce2 Go! 32Mb | 128Mb Ram | WinXP Pro

i'm quite impressed with the speed enhancements, i'm aware not all of this is Dx as i've recently installed Omega nVidia which improved some speed (^_^)
Anata aru kowagaru no watashi! 