Stammy's articles are always a great read. As a developer, I appreciate his perspectives on the intersection of programming and design. I recommend his three-part post on designing and developing a responsive, retina-friendly site.
Shameless self promotion - I just did a talk about protoyping last week that touches on many of the points Paul makes, and also explores some of the tools available. Hope some find it useful here: http://bit.ly/gbks-prototyping
Great post, it is always nice to see how other teams build things. I don't think it is that hard though to just prototype in the Objective-C for iOS or Java for Android. Why the extra JavaScript prototype?
