The nice thing about Amazon Web Services Elastic Cloud Computing is the ability to setup testing instances.  You only need these instances to be available part of the time. The problem with launching new bundles is that sysprep is run and the instance is renamed each time a launch occurs. How do you insure that your instance will be up and running with a minimal amount of effort after launch and keep your server settings?  Use the Ec2ConfigServiceSettings.exe.

This executable is located in either C:\Program Files\Amazon\Ec2ConfigSetup for 32bit instances or C:\Program Files (x86)\Amazon\Ec2ConfigSetup for 64bit instances.  This program is used to adjust the bundle settings of an instance.  The settings will be applied to a bundle the next time a bundle task is executed.  With this executable you can persist the Computer Name, stop the initialization of ephemeral drives, turn off sysprep, and automatically map volume names to drive letters. The settings can be easily changed in one of the three tabs available.  Use this tool next time you want to persist instance settings between launches of an instance.