I used to be 100% against remakes, I have since changed my position in that some songs need to be updated, they need a second (or third) chance.
I had also discovered a band called "Me First and the Gimme Gimmes" a band made up of members from NoFX, Lagwagon and The FooFighters, they cover a lot of music from the '60's and '70's(totally unappealing) but add a punkish, rockin' beat - a new life to lifeless music.
Neil Diamond, Barry Manilow, Billy Joel (not Billie Joe from Green Day), Elton John and even the Beach Boys have been covered, and their songs which may/maynot have been good then are infinitely better covered by these guys.
Post your favourite remakes in this thread, name the artist covering and if possible the original artist.
A few off the top of my head include
Cradle of Filth covering Hallowed be thy Name (Iron Maiden)