Air con for the London Underground, at last

Way back in 2002, I was in Manhattan on my first business trip for the firm.  After spending an evening at an interesting restaurant on the NJ side of the river, my team (some UK based, some US based) & I hopped onto the PATH train.
There was a short delay waiting for the train to depart, but, even in the humid and sticky heat of the evening, we were all cool.  This is because the trains were all cooled by powerful air conditioning.
I was quite taken aback that an underground train had air conditioning, having spent many years leaking sweat on many of the underground trains of London.
However, my US team mates were gobsmacked that the London Underground wasn't air conditioned at all!
Seven years later, it's all change please, all change... As reported by the BBC, there is now a trial of air conditioned rolling stock for the London Underground.  w00t!
Let's see, if we're lucky, there might even be air conditioning on all the underground trains by, <sharp-intake-of-breath> 2012 in time for the Olympics!  Incredible.

(Yes, sarcasm intended...)