Recently, Didier Mamma, our Director of EMEA Strategy, presented at a SOA Event in Paris (I thought the link might be helpful for my American readers) called Sustainable IT Architecture. In it he talks about how to achieve "controllable velocity". Velocity is critical, controlling it ensures speed is achieved with the least amount of cost and waste possible. It's a powerful presentation he gives... though I've heard it in English, this one is in French.
Enjoy!