Google recently disclosed that they are have rolled out OpenFlow for all of their internal networking.
While I have long believed that Software Defined Networking (SDN) is the future, this is the first real proof I have seen that it is commercially viable at scale.
I believe SDN is going to revolutionize the networking industry, allowing us to leave behind all those "boat anchor" legacy concepts like Spanning Tree, and further blurring the lines between layer 2 and layer 3 in the data center.
Here is the original article:
http://www.wired.com/wiredenterprise/2012/04/going-with-the-flow-google/all/1