The Software is a web based PHP5 App running both Mysql and Oracle on top of SLES9. It collects performance information (KPIs) and sends out formatted reports (PDF/XLS) to clients & customers. It's been running on IBM Xseries 336 servers since 2005 (eek!) and really needs an upgrade. Our technical provider came up with the spec but am interested to see if cloud hosting has moved on; I understand it was a bit shakey to start with.
Zynga runs largely on EC2, something like 10,000 nodes. I don't know how to define "shaky", but that company bets hundreds of millions of dollars of revenue on EC2.