It's still down. Here's a useful site for you all
I don't think it has anything to do with applyYourself, the entire gsas site is dead right now, though maybe that was the problem before, I can't say.
It's harvard grad school, the entire world is applying the day before! Maybe I'm being a bit extravagant... lol
http://www.downforeveryoneorjustme.com/http://www.gsas.harvard.edu/apply
EDIT: From Reddit /gradadmissions, here's a link directly to the applyYourself login for Harvard graduate apps!
https://app.applyyourself.com/AYApplicantLogin/fl_ApplicantConnectLogin.asp?id=hgsas