Yep, iTunes is now selling many tracks containing nothing but silence:
Among the other silent tracks are “Silence,” by Ciccone Youth, off “The Whitey Album,” “Silence” by Bill Schaeffer, from the album “Grain of Sand,” and “One Minute of Silence” by Project Grudge, which is offered only as a single-song download. For those looking for the best value, Schaeffer offers nearly two minutes of silence, almost twice as much as any of the other tracks…
Art Garfunkel was ahead of his time.
The Dish 