The Internal Links module, Intlinks, is a simple set (currently two) of input filters which modify the output of internal, root-relative links in any text input format for which they are enabled. The title filter allows you to have the node titles of linked content automatically inserted into the link as the HTML "title" attribute, with "node/123" -type href paths converted to URL aliases, too. It is especially useful for streamlining the editorial workflow and improving SEO. You can also use the "Hide bad" filter to "unlink" unpublished content so visitors don’t encounter "page not found" errors.