Check out a sample store app made by Rob Connery. You can follow the screencast on your blog and download the source code from CodePlex. On your blog, you can follow a series of screencasts and watch how Rob builds a real online store from the ground. He explores real-world issues regarding MVC and tries to adhere to best practices. I found the code and screencast an extraordinary source of inspiration (not just for MVC).
http://blog.wekeroad.com/mvc-storefront/