It might be sensible to mention http://drupal.org/project/InsertNode and it's possibly clashing [node:nid] notation.

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TomChiverton’s picture

TomChiverton commented
Assigned: Unassigned » TomChiverton
Priority: Normal » Minor
Status: Active » Closed (fixed)

I'd never come across that project before. The docs already mentioned attached_node as being incomparable. README updated.
Doesn't seem worth a new release.