A framework designed for WPF and Silverlight which implements a variety of UI patterns including MVVM , MVP and MVC. Caliburn is a legacy framework.

HappyNet is a project using best practices to build an e-commerce web site. It is a full Silverlight application based on a solid architecture (PRISM + MVVM) and the AventureWorks database. It tries to answer some frequent needs and questions from the web.

Silverlight MobileMe Gallery is a 100% pure Silverlight implementation (recreation) of the Apple MobileMe Gallery.

A MVVM related framework for Silverlight (and probably works in WPF) for slow duck tape programmers like my self.