East of the Mississippi uses W, west uses K (a good example is KMOX is St. Louis, and WGN is Chicago...)
There is ONE exception to this however. K something in Pittsburg, it was the first Radio station and they took K before they split it east west.
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut