ezGear has released an A/V cable for iPod and iPhone ($40), it includes a USB cable for charging and syncing as well as composite video and line-out audio RCA connections:
The ezGear Video Cable for iPod includes an iPod dock connector on one end and four connectors on the other end: Video Signal, Left Audio Channel, Right Audio Channel, and USB Connector. The Video and audio connectors connect to your TV, the USB port allows you to charge your iPod while you watch. The ezGear Video Cable is three feet long and shielded to reduce interference. The ezGear Video Cable is Made for iPod and Works with iPhone certified and is made of high quality components to ensure a strong clean signal for better image and audio quality. ezGear also offers a video extension cable that extends the video cable from 3 feet to 6 feet.