Here is a little Photoshop technique I developed the other day to make shiny metal really shiny (click on any image to view a large version).
First duplicate the layer:
Run the High-Pass filter with a large number of pixels so that the shiny areas get emphasised.
Finally then just change the layer blend mode to soft-light ( or hard-light) to make it all shiny:
Beginners guide to Photoshop Layers: