Our game Newbie Chess for iPad has recently appeared in the App Store. It's a Chess game specifically designed for new or casual players. It's all built in Cocos2d of course. We're currently working on a version that supports iPhone (including both Retina and non-Retina).
Read more about it here: http://luminaryapps.com/products/newbiechess/
Or tweet about it with: http://bit.ly/newbiechess
Cheers,
- Joe