We♥Music has posted an extensive collection of Moon River covers
There's a fairly extensive bit of trivia on Moon River over on Wikipedia, including a long list cover artists including Frank Sinatra, Bobby Darin, Perry Como, Louis Armstrong, Paul Anka, Sarah Vaughan, Sarah Brightman, Billy Eckstine, Liz Callaway, Westlife, The Afghan Whigs, Morrissey, R.E.M., Judy Garland, Patsy Ann Noble, Victoria Williams, Barbra Streisand, Bradley Joseph, The Innocence Mission, Ania Dąbrowska, James Last and Andrea Ross.
Im crossing you in style someday
I was so sure that I also had a rendition of Moon River by Tiny Tim, which I can only imagine would be great (I'm so sure I've heard it before, but I'll be damned if I can find it in my music collection).
Given that I have mentioned Tiny Tim now, I feel that I should probably put up one of his tracks. True Love, with Miss Sue, his lovely wife, is a perfect example of the oddness of Tiny Tim. I first came across him on an "outsider music" compilation called Songs in the Key of Z and have since found a full album of his which, to be honest, is pretty tough going to listen to the whole way through.