There is the obvious desaturate, and then tweak curves to get it looking sweet, but any other good ways of getting a B/W image from a colour. (using CS2)
a good way is to use image>adjustments>gradientmap. Select either black and white as your palette or the preset black and white tab. Then you can move the sliders at the bottom, which increases contrast and the balance of black and white levels in the image.
a crap explanation, but its one of the best ways to convert.