"off of" in NYT headline

[David Wake]

http://www.nytimes.com/2010/08/31/business/energy-environment/31coal.html?partner=rss&emc=rss

I've spotted this collocation a few times in the text of weekend
editions, but never in a headline, and never on a weekday.  I wonder
whether this marks an official change in house style, or merely a
change in staff among the copyeditors?

David

------------------------------------------------------------
The American Dialect Society - http://www.americandialect.org