When upgrading PSCS 5 add a new Sharpening procedure. The current one in the Filter Menu is inadequate. The Clarity mode in Camera Raw is better. Improve it and add to PSCS 5.
It's a good request, but in the meantime you can do a clarity-like sharpening in PS by making a duplicate layer, use Unsharp Mask at "High Radius, Low amount". Then double click the layer and use the "Blend If" sliders to remove the effect from the deep shadows and highlights, leaving the mid-tones primarily affected.
Additionally, some files types can be opened directly into the Camera Raw dialog to use the same Clarity slider. You may also want to try HDR Toning, which creates a very similar effect as the Clarity slider. The Clarity control is really about local contrast, which can lead to a sharpening-like effect, but is not technically sharpening.
Clarity isn’t sharpening per say, its Midtone contrast. Its based (originally as far as I’m aware) on the work of Mac Holbert at Nash Editions. Its basically a combo of using Overlay mode with Blend If sliders to focus if you will, the contrast boost on the midtones. You can get an action at Mac’s site to provide this functionality: