Résumé : OMiSCID 2.0 is a lightweight middleware for ubiquitous computing and ambient intelligence. Its main objective is to bring Service Oriented Architectures to all developers. After reviewing related works, we demonstrate how OMiSCID 2.0, compared to other available solutions, integrates easily in classical workflows without adding any constraints on the development process. A basic overview of our middleware is given along with brief technical descriptions demonstrating its User Friendly Application Programming Interface. This application programming interface makes it straightforward to expose, look for or send information between software components over the network. We illustrate the usage of OMiSCID 2.0, the new version of our lightweight middleware, through ase-studies that have been experienced in international research projects. Particularly, we demonstrate its advantages in both development and research projects, illustrating its radical cut down effect in development time, improving software reuse and easing redeployment notably in the context of Wizard of Oz experiments conducted in smart environments.