This may sound minor to most of you, but I just realized how to solve the long headphone cord problem that I've had since I started running.
Unlike most people, the standard iPod earphones don't fit in my ears and fall out constantly. So I've needed to go with more standard sport headphones that look like standard headphones without the foam.
But that leaves a long cord that can get caught in trees, caught by other runners, etc. I just recently discovered that if I tuck the cord from the bottom behind the Nike+ armband and next to my arm that it solves the problem. So, rather than just let the cord dangle from the bottom of the armband, as it naturally would, I'm tucking it next to my arm and letting the cord feed up from the top.
Again, it probably sound ridiculous and obvious but it wasn't either to me so I thought I'd pass it along.