They're here: YouTube's for science content:
Here's a CNN article about them....
These could be useful for certain applications.... On the other hand, I find watching online videos to be somewhat wasteful. I almost always get more information per minute reading something in print than I do watching it on video. Of course, video is unique for visually spectacular events. But as a simply way of transferring information, it lags behind text, often significantly so. Often times you send up sitting through a five-minute video only to find you could have gleaned the same point in 30 seconds of reading. A lot of times I won't even start a video because I doubt it's really going to be a good use of my time....
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