Why the reluctance to use blur? It is acceptable to retouch in other ways, but using a blur is somehow "over the line" when retouching? A blur is too artificial? It's less artificial to use a clone/healing brush/patch tools with something like the Wacom airbrush tool?
For those who are less reticent about using blurs and more focused on pleasing retouch results, here's a few tips:
(1) Concentrate on the green channel. If you want to blur a channel, the green channel is the best candidate.
(2) Skin details like pores are usually most evident in the blue channel. It can also benefit from some softening of details. A little more care is needed here to avoid an artifical look. There is an important line separating highly polished and plastic/waxy.
(3) Make sure to mask the skin before you apply any blur or other methods of softening details like Median. The idea is to give only the skin a polished look.
Keep in mind that lighting matters. Light bouncing off key areas provides shaping for an image. You can apply a curve to the highlights with a luminosity mask (crude), a tone-based mask (better), or something like a Lighten blend and Blend If sliders. For details on a tone-based mask, here are a couple of resources:
http://www.thelightsrightstudio.com/...TheNumbers.pdf http://www.thelightsrightstudio.com/...askToolkit.htm
If there are no highlights, consider adding some modeling with the Photoshop Lighting Effects filter. Harold Heim's Light Machine is a Photoshop add-in that gives you lots of control. You can control both lighting and shadow effects.
I find that applying a diffuse glow, particularly a high key glow provides excellent results. Here are a couple of resources on adding a diffuse glow.
http://www.thelightsrightstudio.com/...hotosAGlow.pdf http://www.thelightsrightstudio.com/TLRDiffuseGlows.htm
If you really must avoid the use of blurs altogether, you can use the patch tool. Look at your image. You need to have portions of skin that are smooth and free from blemishes. Identify the areas you want to replace and the areas that have enough replacement skin to clone. Then create a Merge Visible duplicate layer (alt+ctrl+shift+n+e). Work on the first area you want to replace. Use the patch tool to replace the skin. Then apply a Fade (ctrl-shift-F). This will diffuse the effect of the replacement.
Here's another tip to try:
Make a Merge Visible duplicate layer (alt+ctrl+shift+n+e). Invert the layer. Desaturate it. Add a Reveal All layer mask. Make sure the mask is selected. Now, run Apply Image with Source: filename, Layer: Background, Channel: RGB, Blending: Normal, Opacity: 100%. Click the Blend Mode for the layer to Soft Light.
This maneuver with the layer mask will reduce both the highlights and the shadows. That has the effect of smoothing the skin.
The effect, as described, is appled to the entire image. If you want to limit it to just the skin (recommended), you can mask the skin. Then combine the mask from above and the skin mask with Calculations (a Darken or Multiply blend). Or, you can use a Layer Group/Set in CS/CS2 and then add the mask for the skin to that.
Cheers,
Mitch