http://wayneburkett.com used to host it, but it is no longer there, and I have lost my copy of it. Does anybody have a copy of this floating around out there?
Is this it?
http://dionidium.com/projects/greasemonkey/hnsort.user.js http://dionidium.com/projects/greasemonkey/hnsort.user.js
Edit: Looks like it is.