Two parts to this question,
1) Need a project plan on how to Install WSUS, we are currently running WSUS 3.0 on 2003 server, decided to do a fresh install of WSUS on Windows 2008 R2 SP1, so need a project plan on what things i have to consider when planning/taking notes from old server, So i dont miss out on anything :-)
Can be more like in the first part, Planning Phase-->implementation part-->Cut over Phase.
2) Can I install WSUS 4.0 on Windows Server 2008 R2? if yes whats the installation guide?