The open source framework I created has been released for the 0.6 version, which includes:

Some AJAX control updates

New MVC helpers

An MVP framework agnostic to a specific environment (though with only an ASP.NET implementation at the moment, but more to come there).

Framework Plumbing updates/issue fixes

Several ways to develop custom AJAX components

Sample Code

Some Entity Framework Add-Ons (Optional)

Its available here: http://nucleo.codeplex.com/.  I will follow up with documentation/screencasts.  Please let me know what you think if you try it out.