It most probably is one of the pools (pool operators, please confirm!).
I understand there is a script to predict whether the next block will be a bonus one (I remember there was a thread in this forum for that), but there's no way somebody would somehow surely find it - otherwise, they'd be just finding all blocks in all coins.
I only know the payout address of the 2 DMD pools I mine on. And other than the rare 2 DMD block, I don't see either one of those pools solving any larger than 2.
Those 2 pools are DMD.miner.cc and DMDpool.net
If any of those operators are reading this:
DMDpool.net: Your site is mind-numbingly slow. Get it fixed!
DMD.minar.cc: Please fix your payout for blocks over 1 coin generation. I've worked on blocks that have had 2 DMD and yet the payout is based on 1 coin. Fix it and back-pay the workers!
@Skywave: please give me the link to where you posted in on the frontpage so I can follow it also. Thanks!
We are working on DMDpool.net speed.