Haven't actually read the article yet, but this abstract suggests there might be something pedagogical to this whole screencasting idea, if used correctly. There's an upcoming webcast conference call with the authors on June 17th 7:00PM EDT (what a cruddy time slot!) - you can register at http://www.uliveandlearn.com/innovate/
Innovate - Using Screen Recording and Compression Software to Support Online Learning.
Lyn Barnes, Sheila Scutter, and Janette Young examine the instructional potential of screen recording and compression software in online courses. In a pilot study, they solicited student feedback on the use of 15 Capture CAM-PRO (CCP) recordings in a summer course. These files, each 10 minutes or shorter, did not introduce new course content; instead they reinforced key lessons and addressed student questions. Results from the study indicate that the addition of visual and aural communication helped students feel connected to the instructor and the course; enhanced their understanding of assignments, and improved their comprehension of content.