Worth re-stating that they still had a severe outage due to other speculative corrective measures they took.

http://blog.cloudflare.com/post-mortem-what-todays-network-o...

  Yesterday I posted a post mortem on an outage we had
  Saturday. The outage was caused when we applied an overly
  aggressive rate limit to traffic on our network while
  battling a determined DDoS attacker

Kudos for documenting what you did and what worked.