The Twitter DDoS
blyon.com
blyon.com
I'm not saying this DOS or DDOS is related to the Iran issue, but I am saying that twitter has become a weapon of sorts, a communication enabler that benefits one side of a conflict more than another, so an attack like this is inevitable, even if this particular one isn't coming from the Iranian incumbents.
If I were an attacker, though, I'd attack for a bit, then back off, then attack, then back off, and so on. Intermittent disruption is far more annoying for the users than a sustained attack.
Seems odd to have two huge scale attacks launched within 10 days if they aren't somehow related (testing or proving out a botnet, etc...).
Cisco's anomaly products are designed for service providers, so that they can build "scrubbing centers" in their POPs. Trying to block DDOS traffic at the target is playing to lose.