Just wanted to share http://Wowcall.com with the Yii community.
We moved to the Yii framework just about a year ago, and we have not looked back. The website response time reduced dramatically, we have more flexibility than ever before to stretch our developer muscles.
The site is jam packed with several features including:
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Integration with Back-end telecommunications platform.
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Custom Gamification and Rewards system in place, including badges and points, all designed in Yii.
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One of the most efficient Bulk SMS (300K + sms per account in a few seconds) we have designed, all in Yii!
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Automatic Payment Platform (monthly recurring fees, packages, and garbage collection) designed from top-down in Yii.
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administrative system for customer support agents that integrates with backend.
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Several sensitive Bulk operations (billing, accounts) are done through Yiic, and it has been flawless.
We are nearing our 1 Billion minutes mark, and have reached just over 500K pageviews a day. All in all, consider us Yii spokespersons 
Have a great day!
Wowcall Development Team
