Sharpening Using Lightroom & Camera Raw

Handy article about how to perfect Lightroom sharpening:
http://www.peachpit.com/articles/article.aspx?p=1951754&seqNum=4

The author, Jeff Schewe, previews with the Alt or Opt key and optimises the settings to: SHARPENING AMOUNT 60, RADIUS 0.7, DETAIL 90, MASKING 20; NOISE REDUCTION LUMINANCE 0

Well worth getting your head around the general approach.