PDF Means Change for Many Print Shops 
There is a battle brewing in the back rooms print shops around the country, and after Graph Expo the pressure is on and tempers are flaring. What is causing the problem? PDF. Owners and production managers are going back to their shops to talk about the amazing things they have seen equipment do using PDF files. What they are hearing back from prepress staffs is that PDF files won't work for their shop. Owners are confused and not sure who to believe.
Giles, John. On Demand Journal (2004). Articles>Publishing>Prepress>Adobe Acrobat