Reading Usable Help
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Gordon R. Meyer
Smile, and select the PDF you want to use
The documentation for Smile, an AppleScript editor and authoring toolkit, is provided in PDF. What distinguishes this from most other products, the author has thoughtfully provided two different versions -- one intended for onscreen use, and one intended for print.
Although the differences between the two documents are mostly limited to type size, It's nice to see someone thinking about optimizing their PDFs for how they will be used, instead of just expecting users to suffer through viewing a document onscreen when it has been created using print-centric conventions.