Syed Haris Ali with a new take on a cross platform (iOS and Mac) framework for audio recording, playback and visualisation. This is an impressive, well documented piece of work and if you need visualisation of audio data this is definitely be worth a look.
If you missed the back and forth over the last week or two regarding the new syntax highlighting feature (and associated patent) in iA Writer Pro then count yourself lucky, it was messy. However, one point that struck me was how trivially easy it is to implement a feature like this using NSLinguisticTagger and just a few lines of code. Travis Jeffery shows us how.
Cute macro from Kyle Van Essen to provide compiler errors for key paths which do not exist. The if (NO) should ensure that this is entirely optimised out in release builds so this seems to be a no overhead extra check and much better than @selector(keyPath) or @"keyPath". I really can't see a downside to replacing fragile key paths with this.
I'm not usually a fan of categories designed to reduce the verbosity of Objective-C but NSRegularExpression is one where I would consider a reduction valuable. These categories by Josh Wright look to be a step in the right direction.