There are good informational videos and bad informational videos. The unfortunate fact is that the good ones are few and far between. Part of this has to do with the fact that good presentations are usually the result of thoroughly understanding the subject, planning ahead, scripting the message, and a certain amount of rehearsal. The lack of any, or all, the above usually shows in the final product.

Some of my disinclination toward videos has to do with my being on a dial-up connection where a minute of video may take better than half an hour to download. During this time the download process slows my web browsing. I can't count the times I've invested the time and bandwidth on a video and been deeply disappointed by some half-informed rube blather on. It wouldn't be all bad if it was just entertainment. But for actual reliable information it is usually an abysmal failure.

They aren't often survival related but may of the videos I downloaded and felt good about the time and bandwidth invested were TED talks:

http://www.ted.com/talks

The principle is that you find someone with expertise and an interesting message and give them about ten minutes to explain ground it took years for them to cover. The forced brevity, combined with a need to cover a concept in a well-rounded way, requires a well focused and lively presentation.

If more of them were like TED talks I'd feel better about the typical You-tube fare.