实用Yii扩展

可以去官方搜索Yii扩展：Extensions | Yii PHP Framework

http://www.yiiframework.com/extensions/?tag=tree

Yii checkbox in dropdown

http://stackoverflow.com/questions/11608318/yii-checkbox-in-dropdown

yii_extension_CGridView相关第三方扩展汇总

http://blog.csdn.net/phpgcs/article/details/11928543

Extensions 

http://www.yiiframework.com/extensions/?tag=input&sort=update.desc

jQuery File Upload Demo

xupload，带上传图片预览功能

http://www.yiiframework.com/extension/xupload#hh0