Tomorrow (erm, tonight) I'm going to hook in a .FX file and a proper mesh and get something worthwhile going. Something to challenge my GF7. It'll probably be slower work than tonight because I'll need to look up a load of techniques and stuff (and create textures/maps/content to feed to them). But it's all biscuits in the end.
It would be a really good idea if someone wrote a tool that let you write in an HLSL shader (a la EffectEdit / FX Composer), render it to a texture using a quad, and save out that texture to a file. Could be very handy for generating lookup textures and stuff quickly. Maybe I'll do it.