This paper is concerned with the development of a MultiAgent System (MAS) supporting ubiquitous and personalized interaction with Active Environments. In particular, we propose a system in which a user may delegate her own agent to interact with the environment modeled as a set of agents providing services of different kind. In order to test the system, we implemented a smart to do list in which user can list what she intends to do. According to its content and to the current context situation, the user's personal agent decides to remind tasks or to proactively help the user in performing them. Keywords Personal agents, ubiquitous computing, smart environments.