Although it might not be apparent by my hastely submitted (read: last minute) entry

, I believe the key points would be:
lighting, lighting, lighting
- background can make a difference (plain or scenery) but having 3 points of light minimum makes a huge difference (a plain background can more easily be set up in a photo booth/light tent). 3 point lighting reduces shadow to a minimum.
- do not use your flash (unless its a special flash desighned for this type of photography)
- tripod or camera resting apparatus (pile of books etc.)
- adjusting the white balance (manually or after)
and I am by no means an expert...