AutoTutor - A computer tutor that simulates the discourse patterns and pedagogical strategies of a typical human tutor and uses natural language dialogue. Current research, publications, member contact information. - http://www.autotutor.org/
Applications of AI in Education - "An overview of the main components of intelligent tutoring systems. A brief summary of different types of ITSs, a detailed discussion of two components, the student model and the pedagogical module. We close by discussing some of the open question - http://www.acm.org/crossroads/xrds3-1/aied.html