Apple offers a basic iPad dock for $29 that includes an audio line output and a 30-pin pass-thru connection for connecting to a charging cable, video output cable, or any other accessories that would otherwise plug into the iPad's dock connector. A charging cable is not included with the dock (which seems kinda cheap, if you ask us). The only item in the box is the dock itself.
Now $30 may seem steep for such a basic, bland-looking accessory, but the dock is one of the most attractive solutions we've seen for charging the iPad in your home or connecting the iPad to a stereo system. It is second only to a shammy cloth in our list of top iPad accessories.