I've commented out the link, because the PDF seems to have gone away and the copy of it I have only goes up to chapter 72. I've got email out to its creator asking if he'd like me to host it or transfer the project files so I can keep it up to date.
Fortunately, linkchecker tells me the MF link is the only broken link. (It does complain about spaces and newlines inside URL links, which to my surprise apparently works and only throws warnings.)
Josh's mirror of Harry Potter and the Methods of Rationality has been redesigned by Lightwave (who also did IntelligenceExplosion.com, Friendly-AI.com, and lukeprog.com), and it is now located at a simpler URL: HPMoR.com. Thanks also to Louie who put together this "facelift" project.