You won't find this kind of setup in your produciton clusters for obvious reasons. However, for home labs it's great. You can run virt-manager from inside the guest of the KVM host to which you're connecting. In this case, the KVM host resides on 192.168.2.220; the dev_ws guest (whose desktop you see here) is at 2.221.
In terms of automating Windows Server administration tasks, Microsoft has come a long way from the VBScript and COM Object days of yore. Powershell is, as its name implies, a powerful facility for scripting all manner of Windows-based objects. As such, it has gained widespread use in companies that are heavily invested in the Microsoft infrastructure.
If you are planning to run dkim-milter under CentOS 6, pay special heed to this RedHat Bugzilla issue:
While browsing the SysAdmin subreddit last night, I ran across this item of interest regarding a SSH root vulnerability in RHEL5, 6, and clones. It appears to be mainly users of cPanel, Plesk, and other PHP applications.