For now, we've got the simplest thing:
--html as above
Once that's in place, what we really need next isn't prettier html, but notification. We've got zephyr-via-mit now, but should really add jabber, possibly locally. This means the notifier should be pretty transport-agnostic.
The simplest thing would be to run a separate notifier of change after each run_probes, and send the delta. Possibly also send the baseline once an hour if there are any failures... parsing the html is a lazy way to do this.