The following technical report is available from http://aib.informatik.rwth-aachen.de: Adjoint Code by Source Transformation with OpenAD/F Uwe Naumann, Jean Utke, Patrick Heimbach, Chris Hill, Derya Ozyurt, Carl Wunsch, Mike Fagan, Nathan Tallent, Michelle Strout AIB 2006-05 This document reports on recent advances in the development of the adjoint code generator OpenAD/F. We give an overview of the software design, and we discuss case studies that illustrate the feasibility of adjoint code generation. Our main target application is the MIT General Circulation Model --- a numerical model designed for study of the atmosphere, ocean, and climate.