@Roel

if you actually read the comments in this post (which you didnt), the hack job of making the camera transparent creates all sorts of transparent anomalies. Terrain and models get bad sorting problems, and generally this is unnacceptable. You do get a trail however, but this is not motion blur, only a "z-sort fumble" effect.

@Matt Aufderheide

All of computer graphics is a gimmick, whether you beleive it or not. No matter how many complex calculations are running in a parrallax bump shader, the surface of it is portrayed onto a flat horizon of pixels (your moniter). And since CG nowadays tries to imitate the human eye (like HDR lighting), motion blur is visible to the naked eye. Just shake a pencil fast enough and youll see that it smears.