YTPodcaster can create video podcast from any YouTube channel. Just enter a YouTube username and YTPodcaster will spit out four separate podcast feeds, one for iTunes, another for Zune, one that just shows Flash video, and a fourth that converts YouTube videos into MP4 format.

You can also use YTPodcaster to download any video from YouTube just by entering the URL. Or you can subscribe to YouTube's standard feeds for your region, including the Recently Added, Top Favorites, and Top Rated feeds. A similar service is available at YouTubePodcaster.