Zack and Wiki was not in many stores in USA, and few. In Norway, I visited 3 stores and all had 10 or more Zack and Wikis comming in within the next week. One of the stores had 50 on the backroom too.
I doubt they would send that many to Norway, and none to the rest, so they are really shipping units now (unless this is some kind of nutty coincidence).
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS