There are plenty of videos on YouTube that I have wanted to get the audio and be able to listen to it later. Be it user-generated music,or speeches and presentations,there are enough people out there who don’t have an iPhone (or other smartphones) to watch it on the go,and would like to be able to put it on their mp3 player. ListenToYouTube is a very simple website that does this for you. All you do is enter the URL from YouTube and it gives you an mp3 of the audio. Best part,it is free.
(Found on Lifehacker)