A new adapter has been created by JTT called the IPHDAVAD which has been designed to enable you to add extra ports to your iPad or iPhone using the devices 30 pin docking port.
Once fitted to your Apple device the IPHDAVAD adapter adds support for a HDMI Out, analog TV out, mini USB Port and USB OTG port to your iOS device.
The USB OTG port will allows you if required to connect external USB storage, keyboard or even an additional memory card reader. The new HDMI and USB adapter for iPhone and iPad is now available to purchase in Japan for 4,980 Yen or around $63. If you enjoy building Raspberry Pi projects this awesome Raspberry Pi HDMI input add-on might be worth more investigation.
Source: Akihabara : JTT