You can run a filter on image_send_to_editor, the filter runs inside the get_image_send_to_editor function which is resposible for sending the link HTML that surrounds images sent to the editor.
The filter can be found in core, in wp-admin/includes/media and is linked below for quick reference.
core.trac.wordpress.org/browser/tags/3.1/wp-admin/includes/media.php
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