Well, this is really old news by now. I wanted to post something about it earlier, but never seemed to find the time.
Apparently there was a mixup at MacTech magazine, and my two-part article on developing productivity applications was printed out of order. Part II came out in February's issue. I'm not sure whether Part I will follow in March.
However, there is an upside to this. The good folks at MacTech have released both articles in their entirety onto the web. So, I encourage you to check them out:
Part I: http://www.mactech.com/articles/mactech/Vol.25/25.03/iPhoneProductivityApplicationsPart1/
Part II: http://www.mactech.com/articles/mactech/Vol.25/25.02/iPhoneProductivityApplicationsPart2/
I'm also currently working on a third iPhone article, this time focusing on immersive apps, images and Quartz 2d.