Calling it that is like calling Windows Vista Windows longhorn, Microsoft is no longer using that name. It's officially Windows 7, so everyone should quit calling it other names.
Windows Code name blackcomb now Vienna, and Windows NT 5.1, codenamed "Whistler"; were both named after the Whistler-Blackcomb resort. Vista, codename longhorn, which was an intermediate release, was named after a bar at the Whistler-Blackcomb resort.
Isn't Microsoft smart at the naming? :P