As discussed init would be great to have a ability to run a callback/hook after a link has been checked.
As you can see in the patch at http://drupal.org/node/380052#comment-5526984, I'm adding
'linkchecker_link' => $link, to the options array to add the
$link object and keep it inside httprl responds object. Now I need the ability to execute the function
_linkchecker_status_handling($link, $response); after a link has been checked.
I'm open minded to ideas how we can archive this. The linked linkchecker patch does not allow me to run 128 simultaneous requests and this is why it's important to get such a feature in.