Activation
Here's my sense after reading all these posts.
If you try activating through your iPhone or through iTunes, then you get a message saying you're put into a queue, you'll get an email, please try again later.
There probably really is a queue. If you don't believe it, then you probably believe that everyone is just simply competing like we're all just trying to crowd on to a bus. In which case, it's best to just spend your whole day clicking and trying to find that opening.
But if there is a queue, then should you keep trying? Some people are theorizing that if you keep trying, each time you lose your place in the queue. This makes no sense. Doing this over the internet isn't like calling in to a call-in center. The way you lose your place in line over the phone is by hanging up - that's what exits you from the queue. But there's no active phone line here - you're just a record in a database. For you to lose your place in line, it would mean that AT&T's systems would have to recognize that you're trying to activate again, and then physically delete that record from where it is in line, to then reinsert it (or update the timestamp, or whatever). I suppose anything's possible, but that would be really stupid, even for AT&T. And, I think we've seen examples of people trying to register every thirty seconds and eventually getting it, so I think that logically rules it out.
What's most likely is that you really are in a queue, timestamped for when you first attempted. They get to it when they get to it, and then maybe they're having trouble emailing you. So, it's probably a good idea to re-attempt activation every hour or so to see if it's been activated on AT&T's side, because that way you might get it done sooner than you would if you wait for the email. You can also keep trying every thirty seconds, but it shouldn't hurt.
As for the people getting clever with swapping sim cards, that just seems to complicate matters.
There was one other mention though about China screwing something up, and some people not able to activate at all... I haven't heard any more details on that.