Keep all the excess cable that comes along with your headphones under wraps, while protecting your iPhone, with the Cordli Case ($15-$25). This iPhone case (designed to accommodate an iPhone 4 or 4s) has grooves and clips that weave across its back, letting you stow away 10 to 20 inches of headphone cable. It's perfect for storing shorter headphones while they're not in use, or for taking out some of the slack in a longer cable, avoiding bulk in your pocket. While not yet available, an iPhone 5 case is in the works, and should be ready soon. Available in blue, black, or white.