If you haven't done Blue-Green Deployments, AWS is an excellent environment in which to try them. They reduce a lot of risk during a major push to production. The technique described in this pretty definitive blog post on the topic includes the following services:
- Elastic Load Balancing
- Elastic IP
- Route53 DNS Redirection
- Elastic Beanstalk
If you're trying to follow Continuous Delivery practices, Blue-Green Deployment is definitely a pattern you need to know.