hi, I am a final year mba student ,i liked your idea and would like to add somehing.We used to have such a system in the school-ie we were given a "certificate of appreciation"on leaving the school.Let me tell u it is one of the most coveted document i have amongst all those certificates and marksheets as it tells a story in itself. It used to have an intro about the school,follwed by all details of what i was good at ,subject wise as well as in extracurricular activities.It includes a statement given by the house master and self appraisal as well.If u are to customize that for ur needs i think that wud include a statement by the immediate boss,plus self appraisal followed by all the good that the employee generated