Unpaid Interns.. Who knew?

I just read this article about hiring unpaid interns, and it got me wondering about some internship positions that I am trying to fill at the non-profit that I myself intern for.  It got me thinking about how the FLSA applies to the non-profit setting.  I glanced over the FLSA information website, but I didn't get any information about non-profits really.  Hopefully we're not breaking the law.  We're probably not complying with some of the bullet-points in the article.