Rendermonkey has an amazing depth trick...but it might be DX9.. are there dx8.1 depth shaders out there? I cant find one yet... I have a radeon9600 mobile, and its screaming fast,especially with the this, the "mother of all depth and glow" demos...

http://www.daionet.gr.jp/~masa/rthdribl/index.html#System





Here is a great glow example from the same demo...glow,depth of field, and refraction...wow