Reading Usable Help
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Gordon R. Meyer
The technology of cooking
Cookbooks are often overlooked by instructional designers as a source of inspiration, but cookbooks are perhaps the most successful consumer-level technical documentation ever produced. As evidenced by the fact that most people don't even regard them as "documentation," and by their sheer number and ubiquity in the home.
The book has been a big hit for O'Reilly (disclaimer: they're my publisher too) and aside from the practicality of the tome, it's worth a peek for its instructional approach.