This article discusses the development and functionalities of an intelligent computer-assisted language learning (ICALL) system. By way of example, we describe "E-Tutor", an ICALL system for L2 learners of German that has been in use for a decade. Based on advancements in technology, user studies with L2 learners of German as well as feedback provided by language instructors, students, and researchers, the system has undergone several system updates since its initial implementation in 1999. This article focuses on the pedagogical benefits of ICALL systems by also providing reflections on the development of such systems that resulted from the lessons we have learned in building and maintaining "E-Tutor". (Contains 10 figures and 2 notes.)