Interesting that it is not really a crack but a posting of the encryption keys. Question is where are they getting the keys from. It would be ironic if it was from the Xbox HD-DVD drive. But it could be an inside source too leaking them. The utility simply uses the AACS algorythm (publicly available) to decrypt the discs with the right key.
Now maybe they have broken open a player and managed to tap into the hardware somewhere and read the key off the discs they are playing. Would be funny if it was the samsung player and the final blow for it was that a kill Blu-Ray disc had to go out to kill off that player (i.e. revoke the box).