Great!! We got new version of Prism. You can go and get the latest from this link. Good thing about this release is that they have fixed the Delegate Memory Leak issue (Ref:Memory Leak caused by DelegateCommand.CanExecuteChanged Event) by using WeakEvent pattern. Another good thing is that Prism now supports Silverlight 3. Thanks a lot, Prism team.. :)

Please take a look at the changes in this page. http://msdn.microsoft.com/en-us/library/ee712881.aspx