How Google is pushing the Linux envelope.

I am a member of the Phoenix Linux Users Group or PLUG, and at our last meeting Google gave a presentation on how Linux is used at Google. Vince and Pat explained what Linux is used for and many of the challenges they have faced in pushing the Linux envelope.
While Google has many engineers using Linux, only a few have much experience with Linux. When asked though, they said that there were “not many” Windows machines being used by the engineers.