I see from http://www.Netcraft.com that LiveJournal.com is running Apache/1.3.24 (Unix) Debian GNU/Linux mod_gzip/126.96.36.199a mod_perl/1.26 on Linux.
So perhaps someone with the necessary administration rights should upgrade. Not a job I fancy. I updated my sites last night without any problems but it is always a bit worrying when you need to upgrade.
I don't remember seeing anyone discussing this on lj_dev so my apologies if everyone knows about this already.
Hopefully my next post to lj_dev might be a bit more constructive...