I've done this with all of our Kindles, pre-loaded them. That way when I plugged it in and turned on the wireless, they all started downloading and indexing while it was charging. I've never had a problem with doing it that way. Ever. Others say not to turn on the wireless yet, but hey, I live dangerously. Haven't had to factory reset a Kindle yet. In fact, when I got my K3, I already had 300 books in queue for it.

Hey, I want to spend my time playing with it when it got here, not moving books to it!