title: Identify currently-executing EC2 instance
body: <p>I have an EC2 instance that does work for some time, and when it's finished I want it to terminate itself.  Seems like a simple request, but I can't figure out how to have an instance uniquely identify itself.  The AWS API lets me enumerate the running instances, but if I have several that are booted from the same AMI, how do I find the current one?</p>
  
  <p>I'm running a Windows Server 2008 instance, using the AWS .NET toolkit.</p>