We're planning on doing some database maintenance today, and LiveJournal will be down during this maintenance. The maintenance is scheduled to begin at 12:00 PDT (click to see other timezones) and is expected to last approximately 15 minutes.
You can keep an eye on the LiveJournal Status Page to see when we're back, but we'll also be posting to LiveJournal's Facebook page and LiveJournal's Twitter account to let you know when we're back and to provide any additional updates if we go beyond our planned maintenance window.
[Edit] We're back up again! Thank you for your patience.