Galmour shots charges $75 to do this black and white with a color emphasis thing. Well, their lab does the work, and they use photoshop (amazing the information you can get if you're friendly and play dumb). They also showed me their technique and a few other useful tricks....
Step 1: Grab and image and make a new layer
I never work on the original layer, I always use a copy - you can always turn off the base layer.
Make any adjustments to this layer... adjust curves, light levels etc. This is a good time to clean up skin blemishes etc. (I did not do so for this picture, this was just a quick write up as an example).