Now I have the screen-space directional occlusion working well, here's a pic :) The model I found in the standard Max scenes, I wanted some better geometry to test the lighting than my crappy programmer art.
The scene has just one diffuse shadow-casting spotlight, and the SSDO provides all the rest of the colour, using the environment cube. Note the orange shining on the sides of the crazy model, with occlusion occuring in its upper fins. And the same model, with a different environment.
This is going to look great when weather changes roll in, or during sunsets around planets, or going into nebulae out in space..