LIVEJOURNAL WILL BE DOWN TOMORROW. They say it's for 4 hours but really, just think of it as 7. That way if they're on schedule, you'll be pleasantly surprised, and if something goes wrong (and something might well do, whether due to a renegade doughnut ending up in the wrong place or just plain old human error) then at least you'll be prepared.
Do read the news post and get their new IPs white-listed if you have control over your spam filters.
And just to be on the safe side, back up your LJ! [LJBackup | LJArchive | LJDump | LJBook].