How is that even possible? 

Apparently Bantam are extremely unhappy that this has happened, but can't do much about it. Amazon.de put a hold on any copies that were going out, but a good few dozen were sent out before that.
Westeros.org already has people discussing the book (which is impressive given copies could only have started showing up first thing this morning) and some scans of the new maps in the ADWD subforum.
Amazon says my Dance With Dragons copy is on its way.
- 28/06/2011 11:06:49 AM
1458 Views
As they say, it was a huge screw-up.
- 28/06/2011 12:58:52 PM
906 Views
Major spoilers from the book are being reported on the Westeros forum.
- 28/06/2011 05:35:13 PM
965 Views
Ah, and they just locked them down.
- 28/06/2011 06:49:28 PM
936 Views
How dumb.
- 29/06/2011 04:27:12 AM
1044 Views
Westeros has a very good relationship with Martin and the publisher
- 29/06/2011 05:25:24 AM
821 Views
Bantam stopped Amazon...but the book is apparently on sale in German bookstores today.
- 29/06/2011 03:46:13 PM
822 Views
I have no clue of the business, but why don't they just give it a green light everywhere
- 29/06/2011 04:24:09 PM
964 Views
Street date was broken so it is legal for other booksellers(in that country) to sell it now.
- 29/06/2011 06:36:07 PM
930 Views
