You can get free iPhone ringtones from MacMost.com. Just subscribe to the free iPhone ringtones podcast. You can then download the 100+ free iPhone ringtones to your iTunes library, and then set up your iPhone to make them all available to be used as ringtones.
Gary Rosenzweig looks at two ways to convert video files to mp3 audio files so you can listen to them on audio-only devices. The first method uses QuickTime Pro and iTunes. The second method uses FFMpegX.