Kite crashed. Don't know exactly why (though the kern.log has some strange and scary messages about USB controllers being halted and restarted); the friendly console monkeys got it back up without much fuss, although by that point I was restoring the latest backup and preparing to switch everything over to wren. Which would have been pretty ugly, with 12 hours of mail lost and stuff, so thank goodness that didn't happen.

I've put off finishing the move to wren for too long, but it will still wait until after my trip.