Marty,
Thanks. I agree that the Zevon version is quite good. I am a big fan of his records, particularly the first album. I once considered making a compilation album of all the songs that Linda Rondstadt butchered as covers; Zevon songs would figure prominently.
For novelty covers, I like Bob Dylan and Tiny Tim doing "I got you Babe" (recorded in Tiny Tim's basement--they were friends).
Yes, another thread on treacle would be fun. Speaking of which, I heard the full version of "Seasons in the Sun" (Jacque Brel/Rod McKuen) that had verses that Terry Jacks left out in his cover. It is a MUCH more interesting song. The dead narrator says goodbye to his wife, tells her that he knows she had been screwing around, including his best friend, and threatens to haunt her.