A good friend and Fellow Live Services MVP Chris Pietschmann has just released a javascript control that is ideal for the mvc framework. Check it out here.
http://www.codeplex.com/VEToolkit
A great post describing how to use it.
http://pietschsoft.com/post/2009/03/Prototype-of-VEToolkit-2b-ASPNET-MVC-10-Component-Checked-In.aspx