A site for the kind of people who'd try it to find out.
Actually, it is explained in News News (http://ycombinator.com/newsnews.html), but maybe most people don't bother looking at that.
What kind of site calls a feature "noprocrast" without giving any detailed information about what it does? Only news.yc!
--edit
I wonder why I am being modded down. Maybe I said it too sarcastically. News.YC really does have a terrible interface. Look at the account settings page-- imagine yourself as a user who has never been there before. It's confusing and poorly documented. I love this site for the content and the simplicity, but Paul Graham is a programmer and spent very little time on the user experience, which makes sense. I don't blame him.
But it is still a bad interface. I'm pretty sure 99% of people who fill out the "email" field expect their email to somehow be visible to other users. It's right next to another field that IS visible.
When I hit the little ycn button on my dash, i'm immediately greeted with a list of interesting articles, flanked by comments that are worth reading. That's the most important part of the user experience for us, so here we stay.
It just has a sub-par interface. Compared to other sites, it has a terrible UI. It's not very user friendly, and it could be much more so.
(def good-login (user pw ip)
(let record (list (seconds) ip user pw)
(if (and user pw (aand (shash pw) (is it (hpasswords* user))))
(do (unless (user->cookie* user) (cook-user user))
(enq-limit record good-logins*)
user)
(do (enq-limit record bad-logins*)
nil))))
It might be good to pull the pw out of the record list: ...
(let record (list (seconds) ip user)
...