Some of you may have noticed that although the pools report our hashrate as being ~100Mh/s our client reports 7MH/s
This is simply because of the new defense system. By nature it prevents the hashrate from growing too quickly, so what happens is ~93MH/s of those end up as rejects! At least for a while, until the difficulty adjusts and then ~60Mh/s of those end up as rejects, and then it adjusts again ~10Mh/s of those end up as rejects.
It's still worthwhile to keep mining though because the more hashpower on a given pool/node the more likely it will find a block with the right timestamp.
The client throttles how fast blocks can be found, thus without a difficulty change, regardless of the hashrate,
We are EQUALLY protected.. whether we have 100GH/s or 100MH/s !!!!!
Essentially there is a new un-quantified difficulty factor at play here that uses timestamps to determine how fast we should be going...
This along with our earlier 51% protection makes 51% attacks unfeasible!(For the most part)
Enjoy

PS: For those of you who haven't updated to 0.7.1.1, please update... this protection is only effective in that version..