hai messo il player in un <iframe> ma mi risulta che non hai cambiato la playlisthttp://www.pdagrafica.com/Personale/test/playlist/index.html
prova con questo link:http://www.youtube.com/watch?v=QbMyuynGZhE&feature=share&list=PLyUDLBulhKcsj5EcRQqq19hkaVmIJeLPU
Prova a leggere qui: https://developers.google.com/youtube/2.0/developers_guide_protocol#User_Uploaded_Videos
To request a feed of all videos uploaded by another user, send a GET request to the following URL. This request does not require authentication.https://gdata.youtube.com/feeds/api/users/userId/uploads In the URL above, you should replace the text userId with the user's YouTube user ID. For backward compatibility purposes, the API also supports having the user's YouTube username specified instead.
https://gdata.youtube.com/feeds/api/users/userId/uploads