I don't know if its the best.... but I use it when I find a YouTube video with a song I can't get anywhere else. I put an opera piece in, and it chopped the 2 minutes of talking and recorded just the musical part - brilliant! http://www.YouTube-mp3.org/
oh yeah - you copy and paste the youtube link - then download. its a website instead of a program you have to install.
media conveter currently avaliaable on andro market.download youtube videos by tubemate and then go to media conveter select your video from sd card then convert it.if do you not have android then loudtronix video conveter is best
One of the best free You Tube to mp3 converters is the 'Free YouTube to MP3 Converter' from http://download.cnet.com. The converter is easy to use and it supports some of the media formats like AAC, WAV, OGG, and others.