When I joined the team at Screenlife, they had already partnered with an external agency to create the foundation for the Facebook iteration of their popular game, SceneIt? I was brought on to take over the development, which included bug fixes as well as feature enhancements and additions. The code library for the game used the MVC design pattern, which really opened my eyes into the realm of developmental organization.
It was a great project to work on... and it didn't hurt that I was a big fan of the series...