I am supposed to be working an article, but couldn't resist posting on this one. Our most recent Prism drop (now called Composite Application Guidance) includes a spike we did where we converted our reference app to use Castle Windsor. It was a pretty straight forward effort basically involving a search and replace for wherever we used Unity. We also had to create a Windsor adapter. Fortunately no attributes to remove or anything. There are a few places where we're pretty sure there's a more "Windsor-esque" solution than the way we have done it. I am sure once you guys get your hands on it, we'll soon know what those are.
Get the latest drop here