Just to add more evidence to what many have already suspected, it seems that the PotC sets are indeed going away. Set 4181 has changed to "Call to check product availability." I mentioned this in another thread as well, but Queen Anne's Revenge is now sold out as of today. With The Mill and the London Escape already gone from the site, it seems the writing is very much on the wall for the Pirates of the Caribbean theme. It didn't seem to be exceedingly popular when it was widely available, but it will be interesting to see how this series does in its afterlife.

Have you ever called? I wonder what they say?

I have never called, but that is a great thought. I guess I always assumed it meant that they had very limited stock on hand, and that if you placed an order online, there was a risk of it being cancelled if they ran out. It would be very interesting to call and see what they say though!