Well, I tried again this morning, and it was back to the usual.
Obviously I must have done something yesterday to enable it. I didn't
have time for a lot of trial and error this morning, but I managed to
get it to work again... once. If somebody wants to follow up on that,
here are the steps involved:

sudo /etc/init.d/udev restart
reconnect scanner
sane-find-scanner
scanimage -L
scan from the commandline
run Xsane

But again, it only works once, making it fairly useless. Yesterday I was
able to repeat it.

And there is definetely something wrong with the USB drivers/kernel: I
have a combination mouse/keyboard with a single USB plug, and now the
keyboard will not work after booting (but the mouse will!?) unless I 1)
hammer the keys during the boot to kepp it active 2) unplug & reconnect
the combo after the boot. Good luck trying the second option with a
laptop... so it definitely goes beyond a little scanner problem.

-- 
some usb_devices fault if usb_suspend enabled
https://bugs.launchpad.net/bugs/85488
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Bugs, which is the bug contact for Ubuntu.

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