This paper reports on an action research study investigating the use of online learning activities or "e-tivities" to enhance the learning and assessment experience of students on a distance master's programme. The study suggests that to be successfully integrated in a programme, such activities need to be carefully aligned with learning outcomes and assessment practices, and their value needs to be clear both to students and staff. The paper describes how e-tivities were designed, adopting a constructive alignment approach, to introduce more flexible and innovative approaches to learning and assessment. The e-tivities used a range of technologies (e.g., voice-based discussion boards, podcasts, wikis and blogs) to carry out group-based reflective activities. The study provides some evidence that such e-tivities, particularly voice-based activities, can help provide earlier, more detailed formative assessment, stimulate a more collaborative approach to learning and motivate students to engage more broadly with course content.