I just stumbled across this cool video at the Load Impact blog about the history of DevOps. I'd heard of the Flickr presentation at Velocity ("10+ Deploys a Day: Dev and Ops Cooperation at Flickr"), but there are some very cool tidbits of early history that you may find interesting, especially the start of DevOps-related conversations at Agile conferences and the start of the DevOpsDays conference.
There's a lot of focus on tools and vendors adopting DevOps, and less on books like Continuous Delivery, which I think is an oversight. If Damon wanted to include all the information on important books, it would probably add another five minutes and stretch the definition of "short" in the title.
The video is about 12 minutes long, and presented by Damon Edwards, founder of SimplifyOps and DTO Solutions. It's a great video, and it's always a good idea to have the context of history on your mind as you go forward.