not the fastest site, but easy to ue and works..
www.video2mp3.net
basically u copy and paste url of youtube video and it converts it into an itunes song.
Vuze is legit, i got it a few weeks ago and its great.
Also, use http://www.youtube-mp3.org/, it is the fastest and simplest youtube converter out there. i've used it numerous times, and it has worked perfectly.