The topic I've been discussing at length this week has been sharpening. I've shared a video segment on sharpening basics. I've shared a chapter on Sharpening Basics. I'll wrap this feast of sharpening information from my eBook/video on sharpening (Sharpening Your Photographs) with the chapter on Multipass Sharpening. http://www.thelightsright.com/MultipassSharpening
You'll not only learn about the theory of multipass sharpening, you'll come away with candidate settings for capture sharpening, creative sharpening, and output sharpening.
(The chapter includes ACR 4.1. I need to do an update to include ACR 5 and Lightroom 2.)