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"The proprietary dock connector on the iPod line is nice for a wide line of accessories, but it forces you to carry a uni-purpose iPod cable. The PocketDock lets you sync and charge with miniUSB, the accepted standard, instead.
SendStation's PocketDock, available now, is incredibly tiny, having "the same footprint as Apple's iPod plug," and features a 3.5mm jack in addition to the miniUSB. The 3.5mm jack lets you bypass the volume board used by the headphone jack, giving you clearer sound quality, just like a dock. It's pretty simple, and a little expensive at $30, but if you use a ton of miniUSB gadgets, it'll be worth it."