Okay...
First contribution, here goes:
A remarkable sharpening technique I came across on RetouchPro. You folks should definitely give this a shot. When you've completed editing your image and are ready to apply sharpening, try the following:
1. Merge your finished artwork to a new layer (Mac = cmd+opt+shift+e, PC = ctl+alt+shift+e).
2. In Photoshop, go to Filters-->Other-->Hi Pass. Apply a setting that's just high enough for you to barely make out your image. Remember your setting here, you'll need it for later. Click OK to accept the settings. The resulting image will look horrible, but hang in there.
3. Select the layer to which you've just applied the Hi-Pass. Then go to Filters-->Blur-->Gaussian Blur. Choose a setting that corresponds to about a third of the Hi Pass amount you applied. Click OK to accept then settings.
4. With your Hi-Pass/Blur layer selected in the layers panel, go to the blending modes drop down list at the top of the layers panel and choose "Linear Light" for your blending mode.
5. Your image will be tack sharp! Scale back the layer opacity for the Hi-Pass/Blur layer to reduce the effects to something aesthetically pleasing.