Michael Daley from 71Squared recently published his book Learning iOS Game Programming: A Hands-On Guide to Building Your First iPhone Game. The cool thing about this book, aside from showing you how to make a game start to end, is that it covers how to use Tiled to create your maps and how to use the created maps in your game.
I've personally had the pleasure of reviewing the Tile Maps chapter in Michael's book. While I couldn't look too deep into the code (I'm not familiar with Objective-C), I can say that apart from showing how to use Tiled, it goes into detail about how to parse Tiled's XML based map format and how to render it using OpenGL.
If you're interested in buying the book, please use the provided links, thanks!