Some insights about ... "the largest known DDoS attack ever on the Internet" ... (according to New York Times), from ClouldFlare (service provider that helped mitigate the attack).
Some conclusions:
1) as this attack showed anycast technology seems to be very effective against this kind of attacks.
2) open DNS resolvers are nowadays threat number one when it comes to DDoS attacks (according to Open Resolver Project there are 28 million of resolvers that pose a significant threat).
