We have created an Amazon AMI (Amazon Machine Image) to allow for quick and easy installs of Ghost. This means rather than having a blank Linux image that you then have to install node.js, npm, Ghost, etc. on, it will already be all setup and running once Amazon creates your instance.
This is our very first version of this, so we will be making many upgrades to it in the future (specific www user, better logging, etc) but this should get the job done for now (you can always make those changes yourself if you want). If you would rather install Ghost from scratch instead of using our AMI, check out this article. Now on to the install!