First saw this when we were watching the Grand Prix last weekend and its very, very well done. It seems to have hit the newspapers recently and they claim is was done in one take. Even if that take was the 606th one. Its advertising the new Honda Accord and consists of lots of bits of the car interacting with each other, cartoon style, in a huge chain of events. Its hard to describe, you’ll have to watch it for yourself.
update
It seems the actual advert only used one small amount of CG, pretty impressive. Even that was just to join the two halves together.