Chris Lattner (the original author of LLVM) with a fantastic article on Dr. Dobbs about the design of LLVM. I am not very much of a low level person but this was fascinating, give it a try even if compiler technology isn't something you usually read about.
Colin Donnell on Hockey and its live crash reporting features. I use TestFlight rather than Hockey but they recently added the same feature to their SDK (which hit 1.0 this week). Wouldn't it be nice if iTunes Connect had this level of crash reporting and we didn't need a 3rd party library?
From Illustrator (through SVG export) to Core Graphics Objective-C code in a single button press. It will be interesting to see how complex the input files can be and how reliable the output is but this was an instant purchase for me just in case it works.