The purpose of this volume of Methods in Molecular Medicine is to set forth examples of the great variety of techniques and applications that are now emerging in the field of nonviral gene therapy. The book emphasizes not only specific approaches to gene delivery but, in particular, the best current me- ods to prepare, handle, and characterize gene delivery agents. These topics are of very broad importance since gene therapy evolves from its mostly ac- emy-based experimental and clinical research to the ever increasing number of industry-driven programs directed toward commercial development....