http://www.video2mp3.net/
is a really good site, no real need for downloading songs.. all you do is get the URL (internet address) of the song you want to download on Youtube and paste it into the place on the video2mp3 site. Select high quality then click convert.
This converts the video flash file into an .mp3 file.. then it's ready to download.
No viruses with this, unlike limewire or torrent sites!
They're really good quality too, sound great on CDs!