Introduction - Version Reviewed: 1.2
Regular visitors to the Rob Galbraith Forums will be familiar with Noel Carboni - the high priest of in-camera JPG. 
Since I've been a member of the forums, Noel has many times demonstrated his competence and expertise with Adobe Photoshop. He has recently begun selling his own Photoshop actions, including the liltingly entitled dSLR Fractal Sharpen.
This is what Noel would have us believe:
New Photoshop actions employ the power of fractal algorithms in a unique new way to sharpen digital images. True sharpening with minimal artefacts is now possible with actions that can "see through" fuzz and deliver a sparkling crisp, clean look. Photoshop wizard Noel Carboni has married sophisticated professional Photoshop techniques and the LizardTech Genuine Fractals plug-in to bring you fresh, new image sharpening capabilities.
So, is this Arcadian prose just so much marketing BS, or does dFS have something to offer? Noel sent me a copy of the action set and invited me to see for myself.
The first thing I should say is that dFS requires that you have a copy of the Genuine Fractals plug-in from LizardTech. GF provides the capability to upsize images; it is an alternative to Photoshop's bicubic interpolation (with or without stair interpolation). This is really a significant disadvantage to dFS because apart from Genuine Fractals LE (which is useless to 10D owners), Genuine Fractals 3.0 will cost you USD 159 and Genuine Fractals PrintPro 3.0, the not inconsequential sum of USD 299 (no doubt, excluding VAT for those of us in the EU 
).
dFS itself costs only USD 15. At the same price, Noel also offers the dSLR Tools action set that has a bunch of actions for fixing colour noise, shadows and exposure.
This is simple enough. Noel provides a zip file that contains several ATN files for different GF packages and versions: PrintPro 3.0, Standard Edition 3.0, Trial Download 3.0, Standard Edition 2.5, Standard Edition 2.0, and Mac OS 10 Genuine Fractals 3.0. You just drag the appropriate ATN (I have GF 2.5) to the Photoshop desktop or load using the Actions Palette menu.
There's a "read me" file that contains instructions and information. It seems comprehensive enough - I certainly haven't had any problems.