Today I moved from Castle Project RC3 to Trunk there were a couple changes that I needed to make. The IFilter interface has changed, The ExecuteEnum has changed to ExecuteWhen. The IRailsEngineContext name has changed to IEngineContext. I think there's been a fair amount of refactoring around the Controller, I think the IController interface is new and there is now an IControllerContext interface. The EngineContextModule has been removed, so I needed to remove that from the web.config. and the Windsor integration facility name has changed from RailsFacility to MonoRailFacility, which also required a web.config change. The upgrade seems to be working well.