MP4 videos are what MP3 is to music. With the latest gadgets that playback video such as the iPod Touch, iPhone, PSP, Zune and many other players it is understandable to want videos to go along with these devices. Logically you would want to fill them with free mp4 video downloads. http://www.mp4soup.com is a good resource to use to find places that offer mp4 downloads. Another new tool I found online is http://www.filepop.com which is a YouTube Video downloader and then it will convert it to mp4 so you can transfer to your players.