Was hoping after the huge price drops and overall network drops these kind of attacks would go away, but obviously not. Had a good run of stability ever since the PPS switch, but all we can do in the face of a DDoS is wait.
If you don't have backup miners, I'd recommend pointing to a smaller pool (I won't name any since most smaller pools can't handle a 500+ GH/s surge). If past attacks are any reference, it probably will be at least 12 hours before the kiddies get bored and point their zombie army somewhere else.
Throw some 500Ghash at Bitclockers.com and she will take it