I'd like to have an iPod that can do "mini-broadcasts"; let me explain...
Say you're running down the beach and you see your friend running, too. You both have an iPod. Now, wouldn't it be cool if you can both listen to the same music while running?
"Omigosh, have you heard the new single by *insertfavbandhere*"
"Like, yeah!"
"Wanna listen to it right now?"
"Like, totally!"
So you press a button, that says "transmit" (or whatever label) and your friend presses a button that says "receive" (or whatever label), and while running, you both are simultaneously listening to the same music. YAY!
Winnar.