all fed up
youtube allows you to rss feed by tags like http://www.youtube.com/rss/tag/dublin.rss
it will let you rss against a user like http://www.youtube.com/rss/tag/dojodub.rss
but you have little control over these feeds.
you can control your own playlists in youtube but not rss them 
afaik
so I feed43′ed one of my playlists here as this feed http://www.feed43.com/MyOldGreyTubeTest.xml
the feed43 parse magic is here