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This is the easiest way to do it. Much easier than previously mentioned. Open up a picture that you want to edit. The effect looks better the more colors there are. Anyways go to Select>Color Range. From here you can either choose a preset color (ex. Blue) or use the dropper tool and select the color you want and adjust the fuziness to either select more or less of that range of color. Mess around with it to get the selection you want. Before yo click ok however click the "Invert" box so that you select everything BUT the color you wanted.
Next click Control+U or Adjustments>Color/Hue. Just drag the middle bar (saturation) all the way to the left and voila! You've desaturated the entire picture except for the color you wanted to keep. I'll post an example
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