By way of @ITSinsider, @tweetmeme and @elsua... I just caught this interesting slideshow on Enterprise 2.0 initiatives at Adidas Group by Christian Kuhna. Funny that just a couple weeks ago I announced that Nike would present at the Enterprise 2.0 Conference on their internal collaboration strategy.
So it would seem that the leading Enterprise 2.0 markets are government and, uh... shoes.