I recently started a series of articles on my personal blog revealing Rapid Prototyping insider information. Here are the first two articles if you are interested.

Secrets of ZCorp:
http://desmoda.posterous.com/behind-the-scenes-using-zcorp

The Real Cost of 3D Printing:
http://desmoda.posterous.com/the-real-cost-of-rapid-prototyping