John Allspaw and Paul Hammond:

Communications and cooperation between development and operations isn't optional, it's mandatory. Flickr takes the idea of "release early, release often" to an extreme - on a normal day there are 10 full deployments of the site to our servers. This session discusses why this rate of change works so well, and the culture and technology needed to make it possible.

A recent presentation at Velocity 2009.

See also, Lexically Sparse Slides Improve Recall of Taught Material.

10+ Deploys Per Day: Dev and Ops Cooperation at Flickr