More and more Youtube videos become downloadable as MP4 video (instead of just flash) – and even more already are "behind the scenes" but at at a hidden url. This makes it easy to subscribe to Youtube podcasts/vodcasts to get the mp4 files to your video player – just follow these steps:
1 Register at Youtube and subscribe to video channels
2 Go to the "YouTube 2 iTunes" Yahoo Pipe and fill out your Youtube username
3 Run the pipe, and click the "Get as RSS button"
4 Copy that link, go to iTunes, "Advanced", "Subscribe to podcast" and paste