(No reply under general, so I thought I'd ask the same question in the hacking forum.)
Can someone with an iPad running iOS 4.21 and the camera connection kit please test if you can connect a USB keyboard and type in a text field? This has been unofficially supported in previous iOS versions and I want to make sure it still works before I upgrade.
(Note: You will probably see a "this device is unsupported" mesg upon plugging in. Just click OK and then you should then be able to type. USB keyboards with built-in hubs or extra non-standard buttons might not work.)