The document discusses the integration of cloud computing into the D-Grid infrastructure in Germany. It provides background on D-Grid, including its goals and projects. It then describes the setup of cloud computing at the Dortmund Computing Center, including the use of OpenNebula software to create a private cloud. Key challenges of integrating clouds into D-Grid are identified as user management, authorization, accounting, monitoring, and legal issues regarding virtual organizations. Overall, the document analyzes initial efforts to deploy cloud technologies in D-Grid and important open questions around full-scale integration.