FiiO L9 L-Shaped Line Out Dock (LOD) Cable For iPod and iPhone
works well, gives line out and a solid connection. Better quality than the basic line out from FiiO [[ASIN:B003G8GZV6 FiiO L1 Line Out Dock Cable (LOD) For iPod and iPhone]] which feels like it might break on me, but it's a bit expensive at right around $15