Add template suggestions for location.tpl.php to use a different layout for addresses on specific content types? I have been trying to figure out a method to override the locations.tpl.php template on a per content type basis, but I can't find any good examples on doing this with module template files rather than core template files. Is there code that could be inserted into template.php so that location--blog.tpl.php could be used in the same way that node--blog.tpl.php can be used? Interested in the location module specifically, but would appreciate pointers for general methods of theming contrib modules.
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Drupal 7 Template Suggestions
http://drupal.org/node/1089656

lists template suggestions in core.  It references,

Custom Template Suggestions


  Custom suggestions beyond the ones
  listed below can be created. See the
  page Working with template
  suggestions.
  http://drupal.org/node/223440#custom-suggestions


which provides examples for mod'ing template.php so that "All layers from core, modules, theme engines and themes can provide the suggestions."

which may provide a start for you.