http://cocoadevcentral.com/d/learn_objectivec/
http://www.adamburkepile.com/737/hello-ios-your-very-first-ios-app/
http://www.raywenderlich.com/9328/creating-a-diner-app-using-blocks-part-1
http://www.raywenderlich.com/9438/how-to-use-blocks-in-ios-5-tutorial-part-2
