Faced to the globalization of the markets, SMEs develop new forms of relationships aimed at reinforcing their productivity. One of them is based on the development of networks of SMEs. Even if this concept is not new (see Italian Industrial Districts in the 19th century), it is now growing at a dynamic pace. The concept of Virtual Organizations Breeding Environment (VBE) is one expression of this phenomenon deeply developed in the Ecolead's project. This paper proposes to deliver insighst on this promising concept, associated ICT tools and also a presentation of an in- progress case study.