Paul Hegarty Lectures 13 and 14 in the Stanford CS193 iPhone / iPad development class cover basic data. 13 came out a couple of days ago and covers the theory. Lecture 14, when it is published, will be a demonstration. The entire class is published on iTunes U. and is outstanding.
Here's the course on Stanford's website: http://cs193p.stanford.edu/
Visit iTunes U for videos and slides. Other files (including demo files) are on the Stanford website.
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