We recently made some changes to the DBs which ended up slowing them down quite a bit (turned on a journaling file system) so I'm going to go around now and revert on all of the slaves.
This, however, means that the site will be operating with one less DB server while I go around making these changes. So expect some slowness.
Might be a good idea to go watch some TV, snack, or chat with friends :)
Update: This work was completed, but I forgot to update the entry :) Sorry.