 :: Unfortunately shaded relief maps are more difficult to make.  Simple representations can be made in photoshop (but don't look that good).  The high quality reliefs (such as the google one) are essentially full 3D models, with the shadowing calculated and rendered based on the shape of the terrain.  I have played about with spot views in the past, but only for testing purposes.  Even then it was a lot of playing about to get it to look good - for something the size of SA it would be very very difficult!  Unfortunately I can't take the google image as a base as it is fully copyrighted and thus not suitable for uploading under a free licence.   