What is that scom agent install error again?

There are so many things that can go wrong when trying to push a SCOM agent to machine. And of course my list of favorites grew so large that I had to go and find the article by Kevin Holman again. Just to make sure… here it is:
http://blogs.technet.com/kevinholman/archive/2009/01/27/console-based-agent-deployment-troubleshooting-table.aspx.
Many many thanks to Kevin (actually you can keep saying that to him a lot of the time) :p
And while I am at it, also check this post on agent error troubleshooting by the same :>>.
http://blogs.technet.com/kevinholman/archive/2007/12/12/agent-discovery-and-push-troubleshooting-in-opsmgr-2007.aspx