The iPad Camera Connection Kit allows one to connect their camera to the iPad and upload pictures to latter. However, you can also connect a number of flash drives too!
The kit also allows one to use almost any typical USB device out there, including USB headphone, headset or microphone. The quality by using an after-market VoIP microphone is said to be excellent. USB keyboards work too. But, using them would be less practical as there is no stand while using the adapter.