Missed this thread the first time around, but those who were mentioning "Hallelujah" may be interested in this article on the various versions, especially Choen, Buckley and Cale.
http://www.clapclap.org/2007/04/hallelujah.html
Interesting quote: "If Buckley was covering Cale, there's little doubt that almost all of these people were covering Buckley. And no one was really covering Cohen anymore."