I'm a fan of David Allen's Getting Things Done. As such, I always have my Hipster PDA with me, as well as my iPod. What if I could combine the two..?
Andrew at Restless Dreaming has done it with the Hipster Shuffle. Just replace your hPDA's binder clip with an iPod shuffle (now in color!). Rock out while getting things done. I like it.
You can see the Hipster Shuffle in action here.