[Dah00n]

I'm not sure if that is the whole story. It is as much a case of where the person writing is from. According to Wikipedia both are used. I, as a non-USAnian, would definitely not spell it Whiskey, but Whisky, unless I'm talking about a brand name, no matter if it is from the US or not. It would be like me writing Color instead of Colour when writing in English. One is English, one is not.

[cmrdporcupine]

In Canada we're amazing, we have both British and American conventions mixed together in a seemingly random way:

E.g. "Colourize" is Canadian English (vs American "colorize" or UK "colourise")