updated below after using it for a few days
Block 339057 was found by f92341d8 earning them an extra 0.00783979 BTC in transaction fees.
miners are losing out due to qt users having the ability to specify very low tx fees.
I sent a tx of ~2.5BTC yesterday - and specified the 'normal' tx fee - with a tx fee of only 2230satoshi - it confirmed within 7 blocks, so took not much longer than a tx with 0.0001 tx fee.
I think that the low tx should be capped at a more sensible rate. 0.0001 was fine before, why give people the ability to reduce it by such extents and skim it from the miners?
me no likey.