The number of "double spends" (most of which I believe is mutated transactions) for the last 24 hours:
2014-02-11 16960
(will edit OP to reflect this)
It is slightly lower than I anticipated, as it was already above 16k 9 hours before the CET day ended (24 hours). Maybe the attack subsided, or someone is having a break.
LOL, isn't it MtGox with their custom client trying to re-submit failed transactions relentlessly?
Can you please post a couple of transactions to check what exactly was mutated? Many trivial mutations are already rejected by most nodes. Just want to see what's going on.