The renowned Bitcoin forum bitcointalk.org is currently down due to disk failure. Some rumored that they were attacked with DDoS like last year, but their twitter account sent out the following update today:
Some disks seem to have failed. Expect extended downtime
They also sent out a tweet saying:
Posts made in the last 9 hours might be lost, though we are still trying to recover them. If you still have posts from that time, save them.
What an extended downtime means will only time tell. Comment below if you have more information.