KD's private side is pretty good. I don't consider any of it a secret or anything, just that they would want to restrict it to KD because people's contact info is sometimes included.
We have message boards for alumnae and collegians, a chat room, a find-a-sister option, links to KD clip art, different forms (like recs), and a link to an alumnae newsletter.
Nothing all that exciting. I wish people would utilize it more though.
Hope this helps!
LONG LIVE THE NEBBY PEOPLE!