In this paper we present our aims in the mobiDIÁAK (i.e. mobile STUDENT) portal that we have been developed and are running. Our essential goal was to create a portal engine, that is: (1) self-organizing, i.e. it has built in mechanisms by means of that it is able to exploit the power of the user community around the portal on behalf of its continuous growth; (2) for educational purposes; (3) mobile, i.e. its main services are also accessible from mobile devices. We have developed the portal engine ourselves that serves the basis to the portal. We are running the portal hourly at the Faculty of Informatics at the University of Debrecen, Hungary. We give an overview of the main portal services and also of the content offered by the running portal.