In a paper published this spring, the CSAIL team outlined some key findings on what online learners want from videos. These include:
Brevity (viewers generally tune out after six minutes)
Informality, with professors seated at a desk, not standing behind a podium
Lively visuals rather than static PowerPoint slides
Fast talkers (professors seen as the most engaging spoke at 254 words per minute)
More pauses, so viewers can soak in complex diagrams
Web-friendly lessons (existing videos broken into shorter chunks are less effective than ones crafted for online audiences)
Via Peter Mellow
Analysis from MIT about the features of online videos used in MOOCs that online learners prefer. Interesting analysis for MOOCs but these features could be applied to videos used in any implementation of blended learning.
Also shows that the slick, production theatre videos with a highly professional look may not be the ones that students prefer to watch.