FiiO L1 Line Out Dock Cable (LOD) For iPod and iPhone
My iPod's headphone jack went a bit flaky, so rather than pay to get it fixed or open it myself and risk massacring her aesthetics, I got this and a F/F adapter.  This product works as intended, but my iPod's volume adjustment didn't affect the volume it was shooting out the bottom at all.  Bear in mind the fact that this will give you 100% volume (Fantastic in many cases), but you'll also need a volume adjusting attachment if you plan to go straight from this to headphones.  Other than this unexpected snag