This document discusses how 5th Planet Games, a game development company, has used CloudStack and Amazon EC2 to manage their growing infrastructure needs as their employee count and game offerings expanded over time. It describes how they initially used a few EC2 servers and an RDS database, and now utilize 25 EC2 servers, 10 database servers, and CloudStack to manage resources across multiple zones. The document outlines benefits of CloudStack like automation, cost savings, and ability to tie resources across regions together. It shares how the company uses CloudStack and lessons learned in building out their private cloud.