The Approval nodelet usually has such a copiable reference, though it only appears for writeups, not for infrastructure nodes. (Update: so does the Node Status nodelet.)

However, as the most common reason why I want to copy such a link is refferring to it in a chatterbox message, I have a chatterbox talk form in my free nodelet that's pre-filled with the link. This way, I don't even have to copy, I just write text around it. Here's the relevant source from my Free Nodelet Settings: 

<form method="post" action="?"><font size="-4"><input type="hidden" na
+me="node_id" value="`id`" /><input type="hidden" name="op" value="mes
+sage" /><input type="text" name="message" value="&#x5bid://`id`&#x5d"
+ size="26" maxlength="255" /><input type="submit" name="message_send"
+ value="talk"/></font></form>
<br>

[download]

In reply to Re: Allowing c&p of node headers by ambrus
in thread Allowing c&p of node headers by LanX

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