Xochi is the nice YouTube (, Dailymotion, Vimeo, Niconico) BGM player.
1 million downloads app!!!
*** The Main 3 Features ***
- You can make many playlists of BGM.
- You can share someones playlists.
- You can share your playlists with someone else.
One more thing...
You can do them really SIMPLY!
*** Reviews!!! ***
http://www.appbank.net/2011/09/27/iphone-application/303272.php
http://www.appps.jp/archives/1830681.html
http://www.iphone-girl.jp/application-review/133982.html