The sixth "Agent-based Computing for Enterprise Collaboration" workshop at WETICE 2008 focused on the areas of: agent-based semantic composition of Web services; agent-oriented software engineering methodologies and tools; and large scale multi-agent systems. The intention of this workshop was to bring together researches in the fields of software agents as they relate to the context of enterprise collaboration. This report briefly discusses the content of the papers presented at the workshop by respective authors. Moreover, the report ends with a summary of the main issues and challenges touched during the concluding discussion session.