David M Knoble has been popping in and out of Lightroom Forums.net recently and a recent answer of his led me to his blog. Wow, what a busy guy. Using recently published figures for wavelengths of the sliders in HSL (from Chris Brandon), David created some Black and White presets that are available for download. Along with those, he also has been a prolific poster about Lightroom over the last few months. Well worth a look.