One of the things we have found about running clouds at scale is the need for automation. To that end we often conduct training events called Build a Cloud Days with our open source partners. We like PuppetLabs puppet for automating configuration of CloudStack as well as Zenoss for automating the discover of cloud infrastructure to bring them under monitoring.
One of the best ways to get up to speed on using puppet is to attend a Puppet Camp. The next one will be hosted in Atlanta on February 3rd.
"Puppet Camp is a community oriented gathering of Puppet users and developers. You’ll have the opportunity to network with a diverse group of Puppet users, benefit from insightful lectures delivered by prominent community members, and be able to share experiences and discuss potential implementations of Puppet during our attendee generated breakout sessions."
If you can't attend this session there are many other Puppet Camps being held worldwide listed on the PuppetLabs website.