Ben Gamari writes:

Hello everyone,

Unfortunately Haskell.org, downloads.haskell.org, and hoogle.haskell.org are currently down. We are currently investigating the cause. Updates will be posted as they are available.

A quick update: It sounds as though the outage is due to a hardware issue which our hosting provider is currently investigating but naturally responses are a bit slower than usual due to the holiday. More updates to follow tomorrow. Cheers, - Ben