Advanced Application Examples Needed for Yii Framework

Yii is a very efficient framework both in terms of execution and ease of development. Yii has provided good documentation for starters to understand the framework and the use of its facilities. However, there are not many advanced examples, like the blog example, to help more advanced users put the framework in real-life applications. Are there any advanced examples to demonstrate how to use Yii for developing web applications like eCommerce, Social Network, Content Management System ?