Justin Gehtland and Stuart Halloway has been moving along at a rapid pace on Streamlined since its unveiling at RailsConf in June. There’s now a public repository with the code available and they’ve put together a convincing screencast of its use.
I really like their approach of using separate UI classes instead of contaminating the model classes with administrative concerns. It has a great feel and look to it. Exciting to see it move forward.