Silence is Golden
There's an entire category of news stories that involve auctioning unusual items on eBay, such as fake girlfriends for the dateless and pathetic.
Now it looks like the same thing is going to happen for iTunes. Here's a tongue-in-cheek article about the proliferation of songs available for purchase that are simply one or two minutes of silence. Insert your own John Cage joke here--the author of the article already did.