Production Outage Planning - 10 (or so) points

I've recently went through a number of production planned outages of a group of systems we've recently taken over. I like these outages because of that magical word planned. This isn't planned like you put it in your planner and write down a time, no this is a concrete list with no surprises, no unclear roles, everything is laid out and everyone knows what they are doing. This doesn't seem hard and it really isn't, just takes some attention. Being my 2nd or 3rd one on this current project and I'm noticing some good stuff and possible fail routes that can easily be avoided. More...