If you want to understand the impact of an S3 outage (or many other kinds) ahead of time, Gremlin (http://gremlininc.com http://gremlininc.com) has built a tool

If you want to understand the impact of an S3 outage (or many other kinds) ahead of time, Gremlin (http://gremlininc.com http://gremlininc.com) has built a tool to run these scenarios on your infrastructure. Happy to answer any questions about the tool, either here or over email. (Disclaimer: I work for Gremlin)