Cuponio.de is built with Yii v1.1.13
Cuponio.de was built in about a month using a lot of reusable source code from previous projects built with Yii.
Cuponio.de features
Multi-language
Localisation
Custom URLs
[i](a nice feature here is that actions don’t expect an ID as parameter but instead the model itself hence it’s already
loaded in the custom urls 
. even more, it supports translatable urls using the Yii translation, a custom url rule and an enhanced overloaded createComponent function in the Yii bootstrap)[/i]
Memcached
nginx
Solr
MySQL
Git Deployer (Saves huge amount of time)
AdWords/BingAds API integration
Tons of CronJobs run by an enhanced version of yiic to prevent crons from overlapping etc.
Compass (SASS)
Customised ClientScript hence production version has everything bundled in a single minified file.
The admin panel is still under construction, but thanks to the really well designed CGridView and CMenu it’s a blast and a real pleasure to write it 