I'll believe it when I see it...

So often, someone comes up with something that sounds cool, but unless it's widely adopted, it's just not very useful or interesting.  For example, the gas pump that can also dispense mp3's.  But really, that shouldn't be necessary; I should be able to download mp3's through my cell phone while I'm driving... and automatically synchronize them with my in-dash mp3 player. : )