This is a quick speed model done for a unity cookie facebook challenge,
and a few people asked me what materials, lighting and compositing techniques I used, so I made a nice long theory lesson on not only how I created the effect, but also what each component actually means so you can use these techniques on your own project.
Tutorial + source files: http://metalix.co.nz/tutorial/theory-model-presentation/
If you want the model to follow along you can get it from http://www.facebook.com/unitycookie
(posted on 2nd january-ish so may have to scroll down a bit ;))