For anyone looking to improve their sharpening capabilities, check out The Light's right Studio web site http://www.thelightsrightstudio.com/home.html
Glenn (Mitch) Mitchell has posted updates to the TLR Professional Sharpening Toolkit, TLR Professional Mask toolkit, TLR Sharpening Toolkit, and TLR Edge & Surface Masks were posted in the Digital Darkroom section of the TLR site -- http://www.thelightsrightstudio.com/digital-darkroom.htm
In addition to the updates to his free scripts/actions, he pas produced a wonderful (minor fee) set of documents and tutorials called 'Sharpening Your Photographs' which is now shipping with eBook, video, and ebook/video bundle versions available.
Anyone looking to improve their sharpening should consider this.
BTW...I have no affiliation with Mitch other than a very satisfied user of both the scripts/actions and tutorials.

