i havent found another thread on this and it really helped me so i decided to tell you all how to do it..
step 1: got to this website:http://http://www.vidtomp3.com/index.php
step 2: copy the address of the vid you want into a song into the little box at the bottom and hit convert.
step 3: copy into your itunes folder
and it should be in your library!!
i will post pics if i learn how to embed...
hope it helped! -jakob