Those ordering new Kindles I just went to buy a book and it didn't ask me which card to charge it to like it always did before as I had no default payment set and do not want one set.
It seems the card I use to order the last Kindle because my 1 click card!

I guess should be glad it wasn't my prepay one which I used to pre-order the Touch.
I had to remove both cards to get it removed from the Default Payments on MYK page.
I haven't re enter them yet to see if goes back to the way it was. I can only hope because entering my card each time is a pain.