April 18, 2005
I switched registrars recently, so there may be a gap where the site doesn't appear (it shouldn't happen though, since any server you ask should use either the old record, or the new one, and both point to the same place).
So if the site disappears entirely, the was a cock-up of monumental proportions in the DNS system. If it just goes a long time without an update (like from Friday to 1:00 PM on Monday) that's just me being a slacker.