Current trends in CALL such as mobile learning, gamification, and use of social media appear to represent major shifts in the digital language learning landscape. However, these and other applications of technology to mediate language learning may be informed by reflecting not only on the present but perhaps more importantly on relevant insights from past research and practice. This article draws on selected studies and the author's experience to lay out five key lessons learned over more than three decades in CALL. These lessons involve understanding: (1) the cycle of technology adoption; (2) the dimensions of technology mediation in the language learning process; (3) the promise and limitations of CALL research; (4) the critical importance of teacher education and professional development in an age of continuous change; and (5) the need for learner training for effective technology use. Teachers, researchers, and developers alike are encouraged to reflect on these lessons as they create and seek to control the technologies, tasks, and activities of the future.