YourTube is a handy open source J2ME YouTube video downloader for mobile phones. Using YourTube, you can search for any video you like on YouTube and then save it in suitable format on your phone.
JSR 75 (File Connection API)
-Ability to search YouTube videos.
-Ability to preview screenshots, properties and video stream (if supported by phone).
-Support for multiple video formats.
-Support for background download and download queue.