We recently started using Graphics.Blit() with some utility shaders to perform runtime heightmap->normalmap generation and very fast compositing. Unfortunately, this technique seems not to work in the Flash plugin at the moment. Is this something that might be resolved, or should we expect to develop without Graphics.Blit()? I think we can reproduce the behavior well enough with planes and an ortho camera, assuming RenderTextures work properly.
On a somewhat related note, are Cg conditionals expected to be supported in the Flash exporter?