In your YouTube.com account and in the Playlist settings, you only need to setup a playlist and modify the settings in that playlist.
Once set you will end up seeing this playlist dropdown.. .this is huge for our Pastors.
You have to embed the playlist to have it work, but non the less it real nice for the busy volunteer or youtube user.
One more setting is that you can add a setting in the playlist to automatically add a new video to an existing playlist just by adding an ID or keyword YouTube will look for and associate it with that play list.
for example - I added any video with the word Kris in it, will be added to this playlist….