Robinson Crusoe (Daniel Defoe)
This book demonstrates profiling. You can set Audience to Expert or Novice and different things happen in publishing. It also has two versions: bookmap and map.
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Down and Out in the Magic Kingdom (Cory Doctorow)
This book has RDF markup in a comment in the bookmap and uses uncommon elements like q, lines, and tests some limits of codeblock.
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DITA Keys Example
There’s a full topic devoted to this example. It takes some study to understand, but it demonstrates keys, conkeyrefs, conrefs, and the override principle in the architectural structure. This example has two books and a base structure from which both are derived.
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Other DITA Sample Files
Eliot Kimber had some he converted from Project Gutenberg. You can find them here: http://dita2indesign.sourceforge.net/dita_gutenberg_samples.html