I am almost done with my kids iPhone app and want to add one more gameplay mode to it. I want to add memory concentration or card matching; where there are something like 12 cards on the screen and each one will flip over separately to reveal an image and therefore match to another card. I have not done anything towards this yet other than importing the images I want to use. I have a few ideas on how to go about it, but was wondering what suggestions anyone has for me who has programmed something similar to this. Any code examples are much appreciated! Thank you in advance.

This is just a suggestion but there is a free, open source iPhone game engine called Cocos2d (http://www.cocos2d-iphone.org/)

If you look at some of the samples they have some cool transitions which could be neat in a card game.

I am going to be using cocos2d for a card game implementation - seems like a really easy, great way to develop a simple 2D game!

However, won't cocos2d not work with the new multi-tasking? I thought only the support languages (javascript, objective-c, etc.) worked...