With this blog. Seriously. Go read.
And it makes me think perhaps there should be a touch of balance after the post The Intern Thinks She's Found Something below.
It's true that as authors, you shouldn't count on interns having any power.
Let us be sure to remember, though, that interns are not worthless. (Indeed, my office would quickly be awash in a backlog of work none of the editors have time to do without the (forever blessed) intervention of interns.)
And while some interns will not go on in publishing, I would need my fingers and toes to count the number of fully-grown publishing professionals who I happen to know worked their way up from internships. Me included. (No doubt there are many more among the people I know; I just don't know it.)
And as authors, you should always, always be nice to interns and editorial assistants. They're low on the totem pole now, but give them a few years and they will be in a position to kick your butt for being a jerk to the interns and assistants beneath them. Fyi.