After trying for a while to figure out how it all sort of works and what I was actually looking for, I found this page at Sparkling Client – Downloading Prism.
Once you get there, there is a 10 step method on how to use Prism/CAG or whatever you want to call it.
Not intuitive in any way for Microsoft to hide it by giving it different names (Prism == Composite Application Guidance), but I guess that’s life.
I blame Microsoft’s love (or perhaps just programmer’s vanity) of renaming things that already have a name, but I think it got away on them here.
Update: Herding Code, in an interview with Glenn on Prism / CAG, discovered that Prism is the “Cool Name” whereas Composite Application Guidance is the “Serious Important Name”.
Coming soon: A photo viewer app using Prism. I know it’s been done to death, but it’s a good start.