I rebooted a bunch of our servers earlier today to pick up new kernels. We have our own build of Perl, Apache and other software like that mounted via NFS and on a couple of the boxes the NFS directory didn't get mounted when it booted.
Also on one of the cpansearch boxes squid didn't start up on boot, and it wasn't in our monitoring setup so I only noticed just now because a user wrote in! Doh. (It worked half the time, depending on which server you got).
Our colobus server also didn't start up properly (or rather logging didn't), so the nntp.perl.org server has been flaky through the afternoon.
Anyway, it should all be better now. If not, send us mail.