I enjoy Marco Arment's articles on App design and layout. Making an App truly user friendly is a combination of art and science and Marco is one of the best at it. Moreover, he has a way of explaining his thought process that is fascinating to me. This week he wrote about the re-design of Overcast for the Apple Watch.
As an aside, Overcast is one of my favorite apps on the Apple Watch. Being able to start, stop, and change podcasts from my wrist is golden. I have it active as a glance and then tap on it to get the app and it works swell.