It is often useful to add a "edit this node" or "edit this block" if a site editor is viewing content on a page that is not the node page itself. This includings viewing content from a "view" page where the normal edit tabs are not present for nodes or blocks.
Add the snippet to the template page for the content type. ie node-TYPE.tpl.php
Replace: TYPE with the machine readable name of the content type. TODO: ADD RELEVANT CONTENT TYPE with machine readable name of the content type.
if (user_access('edit any TODO: ADD RELEVANT CONTENT TYPE'))
{
print l('Edit this', 'node/'.$node->nid.'/edit');
}