Hadoop Yarn Direct EC2 Deployment
Here is an up-to-date method for deploying the newest version of Hadoop (2.0, aka. "Yarn") on Amazon EC2. It doesn't require any auto-deployment tools like Whirr, EMR, Hue or Cloudera-Manager.
The steps are methodical and checklist-like, so if that's your preferred style of guide, then I'd bookmark this one.