Don I'd definitely be interested in such a tutorial - can't guarantee I'd understand, but it's something I have wanted to try for a while. The biggest problem I had with Shadows, was understanding how many places they can be influenced. I know of 3 now, each mesh can have shadows turned on or off, each light can have shadows on, off, or adjusted by percentage of penetration, and the Render Options has a check-box for casting shadows during render, which always seems to default to off on bootup. Until I understood that, I had no handle on them at all. In total, they give the user a lot more control over special situations, but it's not exactly intuitive.