I have watched the ACR tutorial twice now, and I'm still getting lot's of "a-ha!" moments. One thing in particular really intrigues me. In one example Jeff mentions pushing the Fill values and then pushing the Blacks. He talks about the sensitivity of the Blacks slider being dependent on the Fill level (?!) This resulted in an apparent increase in shadow detail and to my eyes, an increase in color saturation in the shadows. I have begun using this technique as part of my basic workflow, but it has become quickly obvious through my fumbling and some fairly erratic results that I still don't really understand what I'm doing.
My rudimentary understanding is that the Fill slider controls the luminance values of pixels of low tonality, and Blacks sets the black clip point. Can someone give me a more in depth explanation of what these controls really do, and the "proper" way to integrate them into a RAW workflow?