Yes, I saw one just last week (No, I don't watch much youtube :-). Some people are putting up instructions how to do things that isn't really done any more, to try to save the knowledge for later generations. One can argue how well a choice of youtube is for that but the fact is that many have no other way of getting that information out to a wider audience. I think it's a great way to catch the few that might be interested before the knowledge dies out. Trying to find anyone interested in your little village is usually very hard.