Youtube is great, most of the time, where it fails is if you have a poor or no internet connection, recently I found podsync.net, an online tool that you feed a YouTube url to and it gives you a RSS feed to feed into iTunes, in the background it seems to automagically convert the YouTube videos into an iTunes friendly video (mp4). Lets say I want to subscribe to the entire set of videos uploaded by vialazarus (well last 50 videos).

Copy the URL `https://www.youtube.com/channel/UC25tSeZv5cUx8T6SnlUQFiA` from the address bar, and head over to podsync.net,

Which gives you http://podsync.net/vequ as the RSS to add to iTunes.