http://www.reddit.com/r/Ubuntu/comments/1iy1sv/official_ubuntu_forums_hacked_we_demand_answers/. The Ubuntu forums have been cracked by a malicious user. This person has taken the database and now has all of the password and e-mail information in his/her grasp. This is a more regular occurrence these days. The problem seems to have been a VBulletin mod that was compromised and had administrator privileges and allowed the person to compromise the forum software.
Some information on the status of the forums here: http://test.ubuntu-discourse.org/t/update-on-status-regarding-re-opening-the-forums/754.
Hopefully the forums will be back up soon.