Hi,
Here are some shader sources and shadertool sources.

Bin and Scr Files... I hope that are really shaders, and somehow usefull, even if it isn´t FX. In anyway interesting: http://www.shadertech.com/contest/#hypertexture

Shadertools, like the FX Composer:
http://www.shadertech.com/tools/

And here the best I think. It´s too big for me to download (103mb) but it contains a lot of (120) sample shaders in FX format like, skin shader (you can see images of the shaders on the HP), bloom shader (prince of persia), edge detect shader (not toon, more like pencil drawing), ocean- glass-, fire-, glowtrails-, wood-, hemispherical shaders and more. And it contains tutorials, how to create shaders. It is a free programm to create, watch and edit shaders
http://developer.nvidia.com/object/fx_composer_home.html

BTW: The Rendermonkey seems to be the Ati version of the Nvidia FX Composer. So it is no wonder why some Rendermonkey shaders crashed on Nvidia cards. Maybe some FX Composer shaders crash on Ati cards? But I don´t think so.

EX Citer

Are all compatible with Game Studio? Do they edit images themselves or do they generate file GS can use?

The FX Composer should be as compatiple as rendermonkey of radeon. The rest is less compatible, but if someone knows these languages it should be a help.