On Tuesday I had an email in my inbox - "Just released, Composite UI block". And actually yesterday Alain Leroy and I did a demo about that thing in the Architecture session "Demystifying the Smart Client" at TechEd. Actually this block provides you with a web-part like framework for creating Smart Client applications that allows you to focus on
The important thing from my perspective is really that it supports configurations based on user's role. That means depending on the user's role in the company you can load a number of modules based on the configuration. For more information just take a look at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnpag2/html/cabctp.asp!