The other night I realized that I would like my editor to link for me.  That is, I know what I want to link, but I am too lazy to find the actual URL to stick in there.  This commonly happens on my own personal blog, when I refer to previous events.  I highlight the phrase I want to link and notice that the phrase is descriptive enough that my editor should, via a hover, suggest a list of links for me.  The important thing to note here is that I'm not advocating automatic linking: I want to have control over what phrases are links and what are regular text.  This type of job is good for humans.  But simply looking up the URL of the page I want to reference sounds like a great job for a computer.