Re: YouTube - good or bad for aikido?
YouTube is terrible. Why would anyone buy a professionally produced DVD if they can just get stuff for free from YouTube? Eventually someone will rip the DVD content and post it to YouTube anyway.
DVDs are a great way for a dojo to make some extra cash.
Besides the quality of the video (not the content but the picture size, resolution , color clarity, etc) is typically so poor on YouTube it subtracts a great deal from the content.