I've restored my iPad a couple of times for various reasons. I've installed Pandora after each restore and each time it automatically loaded my account, without asking me for my username/password. My question: How does it do this? I would guess nothing is cached, since the restore would wipe this out. So is it identifying my MAC address and automatically logging me in based on that? That would seem odd (and insecure) to me, since I could return this device to the Apple store and then the next owner would automatically see my Pandora account.