Over the past decade, it has been argued that technology-enhanced learning (TEL) could respond to the needs of the new knowledge society and transform learning. However, despite isolated achievements, TEL has not succeeded in revolutionizing education and learning processes. Most current TEL initiatives still take a centralized technology-push approach in which learning content is pushed to a predefined group of learners in closed environments. A fundamental shift toward a more open and learner-pull model for learning is needed. Recently, the Personal Learning Environment (PLE) concept has emerged to open new doors for more effective learning and overcome many of the limitations of traditional TEL models. In this paper, the authors present theoretical, design, implementation, and evaluation details of PLEF, a framework for mashup personal learning environments. The primary aim of PLEF is to help learners create custom learning mashups using a wide variety of digital media and data.