Great Blog about using Opalis in real world scenarios

http://blogs.technet.com/b/opalis/archive/2010/11/22/opalis-6-3-automating-hyper-v-cluster-patching-using-the-configuration-manager-ip-part-1.aspx

http://blogs.technet.com/b/opalis/archive/2010/12/01/opalis-6-3-automating-hyper-v-cluster-patching-using-the-configuration-manager-ip-part-2.aspx

http://blogs.technet.com/b/opalis/archive/2010/12/02/opalis-6-3-automating-hyper-v-cluster-patching-using-the-configuration-manager-ip-part-3.aspx