Actually, it's really quite simple. I take it you know how to work with photoshop?
Well, all I did was cut out the lips (in other words I made a copy of the lips onto another layer), and gave the initial image a gradient map of black and white. O yeah, I also played around with the curves and contrast a bit. So then of course, the lips stay red, while the rest of the image is black & white!! Simple.
And thanx for the kind words and . Much appreciated!!