We are pleased to welcome you to the eleventh edition of the Middleware c- ference. The program this year is a sign of the robustness, activity, and cont- ued growth of the Middleware community. As computing technology around us has evolved rapidly over the past decade, our notions of middleware have also adapted so that we stay focused on the most challenging and relevant problems for the present and future. As a result, this year's program features papers that belong to both tra- tional areas as well as new directions. Cloud computing, social middleware, and transactional memory are some of...