The Sendstation PocketDock Line Out Mini USB is a useful accessory for your iPhone or iPod, it lets you connect a mini USB cable to your iPhone to sync and charge it.
It also comes with a 3.5mm line out audio jack, which is supposed to give you better sound than the headphone jack.
The PocketDock Line Out Mini USB allows you to easily connect to your home or car stereo or DJ equipment with crystal clear, pristine audio quality.
The possibilities go far beyond just music from the iPod: Get an iPhone app like ooTunes or Sirius XM and listen to Internet or Satellite radio streams on the road. Experience a whole new level of your iPhone/iPod games with powerful sound from big, bold speakers.
I think it a great idea, having a mini USB connecting to charge and sync your iPhone means thats one less cable I have to carry around with me.
If you want one, the Sendstation PocketDock Line Out Mini USB is available for $30 from Sendstation.