To provide the Idiot's Guide version of Scott's answer ;) 

Think of the perspective as your vanishing point from basic drawing. Bigger numbers create a more dramatic vanishing point angle. They'll give you a closer more epic impression. Lower numbers will more accurately represent the geometry of your original object.

Remember to expand the lighting options and play around with the light angle to better control the effect. Regardless of what vanishing point you use, you can make big improvements with the light.

What is "perspective" in the 3D Extrude and Bevel Options?
It seems that both Apple and Microsoft prohibit GPLv3-licensed software in the app stores for their locked-down devices (i.e. iOS, Windows Phone and the Metro part of Windows). I have heard various explanations for this. However: Would they even be able to allow this license in their app stores if they wanted to, or does the GPL's anti-tivoization clause already prohibit this?
