I received the same email. Oddly enough, the last update from Tripit for AA was 6 hours ago. You would think it wouldn't have worked at all today.
That said, I don't use Tripit to monitor my points so it's not a big deal for me.
Nikonshooter brings up a great point. If it affects more than just points monitoring then it's a big deal. If it affects flight updates, then i'll have big issues. That's one of the big services I rely on Tripit for.