hi all,

VideoMP3 is an iPhone app that allow to convert music video into mp3 and then download into iPhone with one touch. Just surf YouTube and choose video, stop play just video is started and use download last video function.
The video will be converted used various free service and download start automatically when conversion is done.
Listen you library with the built-in player or copy the mp3 into iTunes library connecting the iPhone with your desktop using 'iTunes share'

iTunes link:
Video demo :