But it doesn't make sense: TV is such a powerful medium. What is wrong with that picture (literally :-)? Is it the delivery? Is it the rhythm?
A video on the web usually has the camera focused on one person and the screen doesn't completely change too often (if at all). Also, the speaking isn't exaggerated in any way to entice you to pay further attention. Therefore, it doesn't measure up to the levels of excitement/entertainment that your brain is already used to from TV.
On the bright side, those videos should compress much better.
Additionally, some people are aural learners, but others are visual. The latter generally have better synthesis and recall of things they read than things they hear. Such people likely prefer reading summaries than watching the video.
idea #1: play video at 2X (or 1.5X speeed) with no pitch modification, so quickly go through most content. When I focus on the video frame, slow down to normal speed. Maybe have an obvious "rewind 30 seconds" like TiVo, so I can re-hear what sounds interesting
idea #2: tag the video timeline from other users commenting on specific times of the video (I have seen this on some video sites). That helps navigate faster and "move around" a video.
The main problem I see with the video format? Think of DVD vs. VCR. It's about rewinding and direct access. A video player online is just a long line, you get lost very easily. Somehow, you don't get lost navigating pages of text. Haven't you ever been frustrated that you couldn't find back something you just saw in a video? And I don't mean search by keyword...