Anyone knows where to get an ambient occlusion shader for A6, or info, code snippet of this shader

I would like to see something like this too:
http://en.9jcg.com/featured_artists/toni_bratincevic/slow_decay_files/slow_decay_14_l.jpg

build your game out of models/meshes, generate AO maps in your favourite 3d modeller (xsi, maya, max, lw, cinema), export it as a texture and combine it with the shadow map. afaik there's a "radiosity" lightmapper on the forecast page. could take only some years

There is a simpler and more efficient way to do this however. In Crysis for instance they use something screen-space ambient occlusion.

This basically entails rendering the scene's depth first, and then doing to ambient occlusion as a post process. You can find info about this on sites like gamedev.com