If you're one of those people, check out the new lj_maintenance journal, and add it as a friend if you'd like.
I'll be posting there planned downtime both when I plan it, and right before it happens. Knowing when LJ is going down 2 minutes right before it goes down may not seem useful now, but with the upcoming subscription & notification system, you could choose to get emailed or text-messaged when there is a new post to lj_maintenance.
Also in lj_maintenance we'll explain downtime that wasn't planned, so you can laugh at us, or maybe even sympathize. :-)