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Article provides dos and don'ts for usability of mobile apps. Good clean examples. Maybe a little rough visually.
Just keep your designs on close to the ones on the right :).
I'd also like to see how orientation affects ergonomic of an app. One thing I've heard is that when going to landscape you can display less items in the list, but there are surely other things to consider. I'm not sure if title well describes the content of the article.
The article scratches the surface of Ergonomic aspect of mobile design. It touches and pictorially depicts some of the design considerations for mobile applications.