I'm currently working in two large MOSS project (Global Intranet & Internet facing site) where there are requirements to define the governance models and organize training for the end users. It's quote common that companies do not realize the requirements in this area in time and when the projects are already in finalization phase, this causes huge fuzz... Even though the issue was raised immediately when the projects start... well nevertheless... Here's few extremely important links to material which are useful for every single MOSS project out there.
I'm not anymore even counting the times on when the customer have been amazed that Microsoft is providing this kind of guidance and training material... Yes... we actually do also something else rather than only install the products / servers... especially with MOSS.
Following downloads were also extremely interesting, especially the Training Portal Edition, since it can be customized based on the customer case. In large global projects it's extremely important to provide consistent and well planned training materials for the administrators and end users... especially if they don't have necessarily any previous experience on the SharePoint.