Initially we re-launched ethpool.org
as a simple solo mining pool where the block finder gets 100% of the block reward. We could confirm quite quickly that mining ethereum is subject to an incredible high variance. A miner with 25MH/sec found two blocks in one hour (lucky guy) while miners with +200MH/s did not find a block during a full day.
So we tried to combine the best of solo and pool mining into a new payment concept. The new concept awards the full block reward to the miner who did contribute the most unrewarded work to the pool.
The system works like this, every miner starts with 0 credits at the pool. Each submitted valid share increases the credits of a miner by the difficulty of the share. When a block is found the miner holding the most credits will be credited the full block reward and his credits will be reset to 0. This way each miner will receive a predictable payment as soon as his credits at the pool equal the current block difficulty (+/- a few credits caused by the global variance of the pool). You can see the current ranking table at ethpool.org/credits
As a side benefit, the pool never holds on to any funds. Block rewards are paid in full (meaning uncles & transaction) immediately after 10 confirmations.
Check us out at ethpool.org
! Pool fee is currently 0%!