A friend of mine showed me this last night. You just download the application then go to YouTube and copy the URL to the convertor. It then saves the track as an MP3 to your laptop. Simple to use and very handy.
http://www.dvdvideosoft.com/products/dv ... verter.htm
It does say too when your downloading that its saving the video too but going by the file size that ends up being saved its only saving the music.