The Eminent EM9101 Twistable Mini-Stereo Audio Cable solves the problem of determining the exact length of cable you need. Uncoil them to their full lengths; once extended, they hold their shape and will not recoil.
The Eminent Twistable cable can also be used to manage your cables.

With the Eminent EM9101 Twistable Mini-Stereo Audio Cable, you can connect from portable audio player (Walkman, MP3 Player, etc) or notebook PC to stereo audio input device (active speaker system, portable stereo audio recorder, etc).