Capistrano multistage

Capistrano our loveliest tool has got a great plugin which allows us to easily stage releases before they going into production. So you can first deploy to testing and wait for the feedback of the QA/Project Owners and than "push the button" to deploy to production. If you need you could use more stages than testing and production.
http://weblog.jamisbuck.org/2007/7/23/capistrano-multistage