I think this will be a common theme this year, with people cancelling their accounts en masse.
I noticed that the Wikipedia entry has been updated:
http://en.wikipedia.org/wiki/Centurion_Card - Love the last paragraph. It accurately describes the situation, 'systematically'. How to take a good product and really ruin it. Centurion is basically the new Platinum nowadays.
Uli - I think it sounds like you were obviously a good customer of AmEx in Germany, and I hope you made it really clear with them why you are cancelling your card.
Thanks,
Richard