A great guide to setting up password-less SSH login using public/private SSH keys. Great tutorial for setting up additional Amazon EC2 logins.
Amazon :: Curvve Media Blog
Skeddly is the automation toolbox for Amazon EC2. Automate your instance behaviors like start / stop, server load re-sizing, EBS & Snapshop backup and more.
A good guide and refresher on how to create or delete partitions on Linux (Red Hat or Centos). This is especially handy for those new Cloud installations and EBS volumes.