The Nike Amp+ is a wrist band which communicates with your iPod (with Bluetooth, I assume) so that you can start, stop, and browse your tunes. That's not all! It also talks to the Nike+iPod Sport Kit, so you can access information about your run without having to take out your iPod.
I'm not a runner, but this is cool enough that I might just pick one up anyway. No details about pricing or availability are known at this time.