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Links to d.o documentation from api.d.o currently are not very visible, if they exist at all. They are usually buried and readers could benefit from having them pulled out into their own section or highlighted with better markup.
Somehow provide a link from api.d.o topics back to the associated documentation on d.o. For example, there's quite a bit of good information at http://drupal.org/node/37775 on the Form API which topic pages like api.drupal.org/api/drupal/includes!form.inc/group/form_api/7 could link to.