Apparently outages have happened before but they came back up. It's a shame, though, because with the tool you can interpret a site's standing against its competition, how they got to the top, and much what you have to do to get there.
Then just evaluate the top ranked sites' on-page content and you can learn a lot.
I suppose you could go to several other tools and cobble them together to get something similar.
But the allinanchor rankings for the top 10 G rankings are like gold.
I'm devastated because I relied on their datacentre check tool thingy - does anyone know of an equivalent? (the one where you could see where sites ranked for a keyword across a whole bunch of datacentres?)