Testing asynchronous code in Objective-C can be a real pain unless you make one simple change to the way you program it in the first place.
A look at how pushing through discomfort is exactly where I want to be.
A way to make all path changes on a CAShapeLayer be animated automatically.
A library to allow binding a UITableView directly to a to-many property. The library automatically handles insertions and deletions as long as you make sure the to-many property emits KVO notifications.
An extension to NSObject that adds the allows binding the properties of two different objects together, allowing for much more declarative and understandable code.