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September 6, 2014 12:49 AM 
TedX recently commissioned a study of nearly 1,000 videos, segmenting them out by by video type and production style, and discovered this among their other findings:
- Shorter videos are more engaging. Engagement drops after 6 minutes.
- Videos with a more personal feeling are more effective than high-fidelity studio recordings.
- Videos in which the instructor speaks quickly and with high enthusiasm are more engaging.
- Khan-style tablet drawings are more engaging than power point slides.
An interesting study from the EdX people on using videos in an online course.