Here is a list of the articles that I summarized and that Clay and I reviewed for this topic.
Characteristics of the online learner: experiences, participation level, and achievement
Experiential work-integrated online learning: Insights from an established UK higher education program
Learner’s Perspectives on What is Missing from Online Learning: Interpretations through the Community of Inquiry Framework
Multimeida technologies and familiar spaces: 21st-century teaching for 21st-century learners
New Directions Forum: blending asynchronous and synchronous formats
Ten tips for getting learners to take e-courses