Learning diaries--as we employ them--are students' written reflections of their learning experiences and outcomes over the course of university seminars. The writing of such diaries is 'tutored' by a computer program: eHELp supports the writing of sophisticated learning diaries through a modelling and scaffolding of the phases of planning, production and revision. In addition, the learning diaries get published--by uploading them in a cooperation platform--so that the learners can read and discuss their peers' diaries. The main function of such public learning diaries is to enrich traditional university courses (Blended Learning) with additional elaborative, organisational, critical reasoning, and metacognitive activities in order to foster a deeper processing and better retention of the contents to be learnt. We would like to present the educational rationale of our approach and report the findings of corresponding empirical studies.