BTW, did anyone notice the Zanzibar egg on Christmas?
The shark sign changes with your Xbox internal clock. So far, 4 special dates have been found-
January 1st
July 7th (founding of Bungie)
October 31st
December 25th
pretty cool
EDIT: link to Hi-rez pics:
http://ducain.org/hihforum/viewtopic.php?t=2355