Streaming vid (~1 hr): Behind the scenes at Google
One (more) thing which is impressive is they've built their services on top of commodity hardware... no super expensive machines. Just regular stuff with a lot of redundancy. Also, they have a ton of in built stuff - from a Google File System to some map/reduce algorithm which is infrastructure code to be fault tolerant and distribute the load among different machines (mentioned in the talk). They've recently started to share some of this.