As you can see, there's 4 roles that I've mentioned so far, but besides this, there's a deployment scheduler and a couple of build developers, a whole tranch of project people, a Sharepoint consultant and 1st, 2nd and 3rd line support that also need to be considered and communicated with.
http://www.computerweekly.com/blogs/it-fud-blog/2009/11/back-on-the-chaingang.html