Flurry's registration portal should be able to handle HN traffic without any trouble. I'll e-mail them.
EDIT: This looks like a bug, but a bug caused by a user registering with an e-mail already in the system. I'm guessing you've either used Flurry (or Pinch Media, which merged with Flurry) before. Try the 'forgot your password?' link, it'll send you a new one.
EDIT: This looks like a bug, but a bug caused by a user registering with an e-mail already in the system. I'm guessing you've either used Flurry (or Pinch Media, which merged with Flurry) before. Try the 'forgot your password?' link, it'll send you a new one.