Well being a USB connection and seeing as how the SDK opened up hardware support in 3.0 I would say it could be used for basically anything there is an app for. Plug an iPod into your iPad!!! Would that make it asplode?
how about normal audio out features, i have a car stereo with a usb connection, and i've recently bought a camera connection kit, my problem is that it doesnt find my ipad, does any know of any audio out apps that might help link the 2 (car stereo/ipad) together? cheers