Last week I attended LISA '11 conference and one of the great and fun presentations was Bryan Cantrill's talk titled "Fork Yeah! The Rise and Development of illumos".
See the video and the slides.
Also, if you are interested in the whole DevOps transformation watch Ben Rockwood's talk - see the video and the slides.
There were more interesting talks - you can find them at http://www.usenix.org/events/lisa11/tech/