The UbuntuForums have recently been hacked, with Canonical advising anyone who uses the same user name/password for other services, such as email, to change your password immediately. Other Ubuntu-based services, such as Launchpad and UbuntuOne have not been affected by this incident.
However, what disturbs me the most is what Canonical posted in response to this hack:
Unfortunately the attackers have gotten every user’s local username, password, and email address from the Ubuntu Forums database.
I sure hope they didn’t mean “every user” in the literal sense!
If any users need Ubuntu-related help, you can still go to AskUbuntu, as that sight is still up and running (unless you prefer Club Myce!).