When you do Continuous Deployment you can deploy whenever you want: you made it as easy as possible and you have become very good at it. Every engineer knows how to deploy the application to any environment. The Product Department can always see the latest bells and whistles as they are built because you have Stable servers running the latest versions of the application. You implement big changes gradually and show them to Product while keeping the customer's experience stable. When you decide to release, you have made sure all things will work and you know how to react if nevertheless they break, without fires or panic.
Continuous Deployment also forces you to do many right things: repeatable builds; the exact same deployment process in all environments, including the developer's machines and a development environment that is as close to Live as possible; backwards-compatible database changes; easy rollbacks; code that is split into components; good tests...
In this talk I give an introduction to Continuous Deployment: why you should care, what it means and I propose a few first steps towards introducing this methodology.