With iTunes 11 out there may be less and less folk that have iTunes 10 kicking around much longer. Keep searching for this and be sure to ask how to do this on iTunes 11.
I am unable to find out how to publish a playlist in itunes 10. As you can see from the comments in this article I am not alone...can anyone help ? http://www.wondershare.com/apple-software/share-itunes-playlists.html