The also linked http://martinfowler.com/bliki/PhoenixServer.html http://martinfowler.com/bliki/PhoenixServer.html is good. My startup has been in production on

The also linked http://martinfowler.com/bliki/PhoenixServer.html http://martinfowler.com/bliki/PhoenixServer.html is good. My startup has been in production on EC2 for 6 months, and I think we've never had a server up for more than 3 days, and never booted a production box from an AMI more than 2 weeks old.