Update Feb. ’09: Also found this version on YouTube; enjoy!
The sound quality isn’t ideal, but it’s a wonderfully unique use of the instruments, and the kids do a really good job (somewhat strained vocals at the end not withstanding).
On a slightly weirder note, there’s harptallica.com – harp duet versions of 10 Metallica songs, coming soon to a CD near you (be afraid… be very afraid).