Reply To: Displaying Sample Brochures

One of the techniques to do this is through smart objects in Photoshop. You create a shape the size of the actual flap. You convert it to a smart object, and then you transform it with distort and skew to the effect that you want. You can add a subtle gradient overlay to give it the effect of depth. Then you just open the smart object and place any file that you want, and it updates in the parent document with all the distortions.